ports/cef: Use the CEF translator tool to generate the full set of CEF

bindings.

This replaces hand-implemented CEF bindings with proper Rust wrappers
automatically generated from the C++ headers. This means that, whenever
CEF's C++ headers change, we can easily generate both the appropriate C
API and the appropriate Rust API. It eliminates much of the hand-written
unsafe code within the CEF port, because the CEF translator tool now
knows how to generate Rust smart pointer wrappers for each class that
corrently perform reference counting.

Additionally, this commit adds utility macros (located in `macros.rs`)
that make it easier to correctly expose Rust objects as CEF objects.
They handle the marshaling of objects between Rust and CEF properly.
The net result of this is that you can write mostly-natural-looking Rust
in the CEF port and interact with it with a natural-looking C++ API on
the embedding side.

This setup relies on the branch of CEF located here:

    https://github.com/pcwalton/chromium-embedded-framework

To regenerate, follow the instructions in `ports/cef/README.md`. For
convenience, and because I don't anticipate the API to change much, I
have vendored in all of the appropriate interfaces.

ports/cef/interfaces/cef_request_handler.rs

@@ -0,0 +1,841 @@
+// Copyright (c) 2014 Marshall A. Greenblatt. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the name Chromium Embedded
+// Framework nor the names of its contributors may be used to endorse
+// or promote products derived from this software without specific prior
+// written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// ---------------------------------------------------------------------------
+//
+// This file was generated by the CEF translator tool and should not be edited
+// by hand. See the translator.README.txt file in the tools directory for
+// more information.
+//
+
+#![allow(non_snake_case, unused_imports)]
+
+use eutil;
+use interfaces;
+use types;
+use wrappers::CefWrap;
+
+use libc;
+use std::collections::HashMap;
+use std::ptr;
+
+//
+// Callback structure used for asynchronous continuation of quota requests.
+//
+#[repr(C)]
+pub struct _cef_quota_callback_t {
+  //
+  // Base structure.
+  //
+  pub base: types::cef_base_t,
+
+  //
+  // Continue the quota request. If |allow| is true (1) the request will be
+  // allowed. Otherwise, the request will be denied.
+  //
+  pub cont: Option<extern "C" fn(this: *mut cef_quota_callback_t,
+      allow: libc::c_int) -> ()>,
+
+  //
+  // Cancel the quota request.
+  //
+  pub cancel: Option<extern "C" fn(this: *mut cef_quota_callback_t) -> ()>,
+
+  //
+  // The reference count. This will only be present for Rust instances!
+  //
+  ref_count: uint,
+
+  //
+  // Extra data. This will only be present for Rust instances!
+  //
+  pub extra: u8,
+} 
+
+pub type cef_quota_callback_t = _cef_quota_callback_t;
+
+
+//
+// Callback structure used for asynchronous continuation of quota requests.
+//
+pub struct CefQuotaCallback {
+  c_object: *mut cef_quota_callback_t,
+}
+
+impl Clone for CefQuotaCallback {
+  fn clone(&self) -> CefQuotaCallback{
+    unsafe {
+      if !self.c_object.is_null() {
+        ((*self.c_object).base.add_ref.unwrap())(&mut (*self.c_object).base);
+      }
+      CefQuotaCallback {
+        c_object: self.c_object,
+      }
+    }
+  }
+}
+
+impl Drop for CefQuotaCallback {
+  fn drop(&mut self) {
+    unsafe {
+      if !self.c_object.is_null() {
+        ((*self.c_object).base.release.unwrap())(&mut (*self.c_object).base);
+      }
+    }
+  }
+}
+
+impl CefQuotaCallback {
+  pub unsafe fn from_c_object(c_object: *mut cef_quota_callback_t) -> CefQuotaCallback {
+    CefQuotaCallback {
+      c_object: c_object,
+    }
+  }
+
+  pub unsafe fn from_c_object_addref(c_object: *mut cef_quota_callback_t) -> CefQuotaCallback {
+    if !c_object.is_null() {
+      ((*c_object).base.add_ref.unwrap())(&mut (*c_object).base);
+    }
+    CefQuotaCallback {
+      c_object: c_object,
+    }
+  }
+
+  pub fn c_object(&self) -> *mut cef_quota_callback_t {
+    self.c_object
+  }
+
+  pub fn c_object_addrefed(&self) -> *mut cef_quota_callback_t {
+    unsafe {
+      if !self.c_object.is_null() {
+        eutil::add_ref(self.c_object as *mut types::cef_base_t);
+      }
+      self.c_object
+    }
+  }
+
+  pub fn is_null_cef_object(&self) -> bool {
+    self.c_object.is_null()
+  }
+  pub fn is_not_null_cef_object(&self) -> bool {
+    !self.c_object.is_null()
+  }
+
+  //
+  // Continue the quota request. If |allow| is true (1) the request will be
+  // allowed. Otherwise, the request will be denied.
+  //
+  pub fn cont(&self, allow: libc::c_int) -> () {
+    if self.c_object.is_null() {
+      panic!("called a CEF method on a null object")
+    }
+    unsafe {
+      CefWrap::to_rust(
+        ((*self.c_object).cont.unwrap())(
+          self.c_object,
+          CefWrap::to_c(allow)))
+    }
+  }
+
+  //
+  // Cancel the quota request.
+  //
+  pub fn cancel(&self) -> () {
+    if self.c_object.is_null() {
+      panic!("called a CEF method on a null object")
+    }
+    unsafe {
+      CefWrap::to_rust(
+        ((*self.c_object).cancel.unwrap())(
+          self.c_object))
+    }
+  }
+} 
+
+impl CefWrap<*mut cef_quota_callback_t> for CefQuotaCallback {
+  fn to_c(rust_object: CefQuotaCallback) -> *mut cef_quota_callback_t {
+    rust_object.c_object_addrefed()
+  }
+  unsafe fn to_rust(c_object: *mut cef_quota_callback_t) -> CefQuotaCallback {
+    CefQuotaCallback::from_c_object_addref(c_object)
+  }
+}
+impl CefWrap<*mut cef_quota_callback_t> for Option<CefQuotaCallback> {
+  fn to_c(rust_object: Option<CefQuotaCallback>) -> *mut cef_quota_callback_t {
+    match rust_object {
+      None => ptr::null_mut(),
+      Some(rust_object) => rust_object.c_object_addrefed(),
+    }
+  }
+  unsafe fn to_rust(c_object: *mut cef_quota_callback_t) -> Option<CefQuotaCallback> {
+    if c_object.is_null() {
+      None
+    } else {
+      Some(CefQuotaCallback::from_c_object_addref(c_object))
+    }
+  }
+}
+
+
+//
+// Callback structure used for asynchronous continuation of url requests when
+// invalid SSL certificates are encountered.
+//
+#[repr(C)]
+pub struct _cef_allow_certificate_error_callback_t {
+  //
+  // Base structure.
+  //
+  pub base: types::cef_base_t,
+
+  //
+  // Continue the url request. If |allow| is true (1) the request will be
+  // continued. Otherwise, the request will be canceled.
+  //
+  pub cont: Option<extern "C" fn(
+      this: *mut cef_allow_certificate_error_callback_t,
+      allow: libc::c_int) -> ()>,
+
+  //
+  // The reference count. This will only be present for Rust instances!
+  //
+  ref_count: uint,
+
+  //
+  // Extra data. This will only be present for Rust instances!
+  //
+  pub extra: u8,
+} 
+
+pub type cef_allow_certificate_error_callback_t = _cef_allow_certificate_error_callback_t;
+
+
+//
+// Callback structure used for asynchronous continuation of url requests when
+// invalid SSL certificates are encountered.
+//
+pub struct CefAllowCertificateErrorCallback {
+  c_object: *mut cef_allow_certificate_error_callback_t,
+}
+
+impl Clone for CefAllowCertificateErrorCallback {
+  fn clone(&self) -> CefAllowCertificateErrorCallback{
+    unsafe {
+      if !self.c_object.is_null() {
+        ((*self.c_object).base.add_ref.unwrap())(&mut (*self.c_object).base);
+      }
+      CefAllowCertificateErrorCallback {
+        c_object: self.c_object,
+      }
+    }
+  }
+}
+
+impl Drop for CefAllowCertificateErrorCallback {
+  fn drop(&mut self) {
+    unsafe {
+      if !self.c_object.is_null() {
+        ((*self.c_object).base.release.unwrap())(&mut (*self.c_object).base);
+      }
+    }
+  }
+}
+
+impl CefAllowCertificateErrorCallback {
+  pub unsafe fn from_c_object(c_object: *mut cef_allow_certificate_error_callback_t) -> CefAllowCertificateErrorCallback {
+    CefAllowCertificateErrorCallback {
+      c_object: c_object,
+    }
+  }
+
+  pub unsafe fn from_c_object_addref(c_object: *mut cef_allow_certificate_error_callback_t) -> CefAllowCertificateErrorCallback {
+    if !c_object.is_null() {
+      ((*c_object).base.add_ref.unwrap())(&mut (*c_object).base);
+    }
+    CefAllowCertificateErrorCallback {
+      c_object: c_object,
+    }
+  }
+
+  pub fn c_object(&self) -> *mut cef_allow_certificate_error_callback_t {
+    self.c_object
+  }
+
+  pub fn c_object_addrefed(&self) -> *mut cef_allow_certificate_error_callback_t {
+    unsafe {
+      if !self.c_object.is_null() {
+        eutil::add_ref(self.c_object as *mut types::cef_base_t);
+      }
+      self.c_object
+    }
+  }
+
+  pub fn is_null_cef_object(&self) -> bool {
+    self.c_object.is_null()
+  }
+  pub fn is_not_null_cef_object(&self) -> bool {
+    !self.c_object.is_null()
+  }
+
+  //
+  // Continue the url request. If |allow| is true (1) the request will be
+  // continued. Otherwise, the request will be canceled.
+  //
+  pub fn cont(&self, allow: libc::c_int) -> () {
+    if self.c_object.is_null() {
+      panic!("called a CEF method on a null object")
+    }
+    unsafe {
+      CefWrap::to_rust(
+        ((*self.c_object).cont.unwrap())(
+          self.c_object,
+          CefWrap::to_c(allow)))
+    }
+  }
+} 
+
+impl CefWrap<*mut cef_allow_certificate_error_callback_t> for CefAllowCertificateErrorCallback {
+  fn to_c(rust_object: CefAllowCertificateErrorCallback) -> *mut cef_allow_certificate_error_callback_t {
+    rust_object.c_object_addrefed()
+  }
+  unsafe fn to_rust(c_object: *mut cef_allow_certificate_error_callback_t) -> CefAllowCertificateErrorCallback {
+    CefAllowCertificateErrorCallback::from_c_object_addref(c_object)
+  }
+}
+impl CefWrap<*mut cef_allow_certificate_error_callback_t> for Option<CefAllowCertificateErrorCallback> {
+  fn to_c(rust_object: Option<CefAllowCertificateErrorCallback>) -> *mut cef_allow_certificate_error_callback_t {
+    match rust_object {
+      None => ptr::null_mut(),
+      Some(rust_object) => rust_object.c_object_addrefed(),
+    }
+  }
+  unsafe fn to_rust(c_object: *mut cef_allow_certificate_error_callback_t) -> Option<CefAllowCertificateErrorCallback> {
+    if c_object.is_null() {
+      None
+    } else {
+      Some(CefAllowCertificateErrorCallback::from_c_object_addref(c_object))
+    }
+  }
+}
+
+
+//
+// Implement this structure to handle events related to browser requests. The
+// functions of this structure will be called on the thread indicated.
+//
+#[repr(C)]
+pub struct _cef_request_handler_t {
+  //
+  // Base structure.
+  //
+  pub base: types::cef_base_t,
+
+  //
+  // Called on the UI thread before browser navigation. Return true (1) to
+  // cancel the navigation or false (0) to allow the navigation to proceed. The
+  // |request| object cannot be modified in this callback.
+  // cef_load_handler_t::OnLoadingStateChange will be called twice in all cases.
+  // If the navigation is allowed cef_load_handler_t::OnLoadStart and
+  // cef_load_handler_t::OnLoadEnd will be called. If the navigation is canceled
+  // cef_load_handler_t::OnLoadError will be called with an |errorCode| value of
+  // ERR_ABORTED.
+  //
+  pub on_before_browse: Option<extern "C" fn(this: *mut cef_request_handler_t,
+      browser: *mut interfaces::cef_browser_t,
+      frame: *mut interfaces::cef_frame_t,
+      request: *mut interfaces::cef_request_t,
+      is_redirect: libc::c_int) -> libc::c_int>,
+
+  //
+  // Called on the IO thread before a resource request is loaded. The |request|
+  // object may be modified. To cancel the request return true (1) otherwise
+  // return false (0).
+  //
+  pub on_before_resource_load: Option<extern "C" fn(
+      this: *mut cef_request_handler_t, browser: *mut interfaces::cef_browser_t,
+      frame: *mut interfaces::cef_frame_t,
+      request: *mut interfaces::cef_request_t) -> libc::c_int>,
+
+  //
+  // Called on the IO thread before a resource is loaded. To allow the resource
+  // to load normally return NULL. To specify a handler for the resource return
+  // a cef_resource_handler_t object. The |request| object should not be
+  // modified in this callback.
+  //
+  pub get_resource_handler: Option<extern "C" fn(
+      this: *mut cef_request_handler_t, browser: *mut interfaces::cef_browser_t,
+      frame: *mut interfaces::cef_frame_t,
+      request: *mut interfaces::cef_request_t) -> *mut interfaces::cef_resource_handler_t>,
+
+  //
+  // Called on the IO thread when a resource load is redirected. The |old_url|
+  // parameter will contain the old URL. The |new_url| parameter will contain
+  // the new URL and can be changed if desired.
+  //
+  pub on_resource_redirect: Option<extern "C" fn(
+      this: *mut cef_request_handler_t, browser: *mut interfaces::cef_browser_t,
+      frame: *mut interfaces::cef_frame_t, old_url: *const types::cef_string_t,
+      new_url: *mut types::cef_string_t) -> ()>,
+
+  //
+  // Called on the IO thread when the browser needs credentials from the user.
+  // |isProxy| indicates whether the host is a proxy server. |host| contains the
+  // hostname and |port| contains the port number. Return true (1) to continue
+  // the request and call cef_auth_callback_t::cont() when the authentication
+  // information is available. Return false (0) to cancel the request.
+  //
+  pub get_auth_credentials: Option<extern "C" fn(
+      this: *mut cef_request_handler_t, browser: *mut interfaces::cef_browser_t,
+      frame: *mut interfaces::cef_frame_t, isProxy: libc::c_int,
+      host: *const types::cef_string_t, port: libc::c_int,
+      realm: *const types::cef_string_t, scheme: *const types::cef_string_t,
+      callback: *mut interfaces::cef_auth_callback_t) -> libc::c_int>,
+
+  //
+  // Called on the IO thread when JavaScript requests a specific storage quota
+  // size via the webkitStorageInfo.requestQuota function. |origin_url| is the
+  // origin of the page making the request. |new_size| is the requested quota
+  // size in bytes. Return true (1) and call cef_quota_callback_t::cont() either
+  // in this function or at a later time to grant or deny the request. Return
+  // false (0) to cancel the request.
+  //
+  pub on_quota_request: Option<extern "C" fn(this: *mut cef_request_handler_t,
+      browser: *mut interfaces::cef_browser_t,
+      origin_url: *const types::cef_string_t, new_size: i64,
+      callback: *mut interfaces::cef_quota_callback_t) -> libc::c_int>,
+
+  //
+  // Called on the UI thread to handle requests for URLs with an unknown
+  // protocol component. Set |allow_os_execution| to true (1) to attempt
+  // execution via the registered OS protocol handler, if any. SECURITY WARNING:
+  // YOU SHOULD USE THIS METHOD TO ENFORCE RESTRICTIONS BASED ON SCHEME, HOST OR
+  // OTHER URL ANALYSIS BEFORE ALLOWING OS EXECUTION.
+  //
+  pub on_protocol_execution: Option<extern "C" fn(
+      this: *mut cef_request_handler_t, browser: *mut interfaces::cef_browser_t,
+      url: *const types::cef_string_t,
+      allow_os_execution: *mut libc::c_int) -> ()>,
+
+  //
+  // Called on the UI thread to handle requests for URLs with an invalid SSL
+  // certificate. Return true (1) and call
+  // cef_allow_certificate_error_callback_t:: cont() either in this function or
+  // at a later time to continue or cancel the request. Return false (0) to
+  // cancel the request immediately. If |callback| is NULL the error cannot be
+  // recovered from and the request will be canceled automatically. If
+  // CefSettings.ignore_certificate_errors is set all invalid certificates will
+  // be accepted without calling this function.
+  //
+  pub on_certificate_error: Option<extern "C" fn(
+      this: *mut cef_request_handler_t, cert_error: types::cef_errorcode_t,
+      request_url: *const types::cef_string_t,
+      callback: *mut interfaces::cef_allow_certificate_error_callback_t) -> libc::c_int>,
+
+  //
+  // Called on the browser process IO thread before a plugin is loaded. Return
+  // true (1) to block loading of the plugin.
+  //
+  pub on_before_plugin_load: Option<extern "C" fn(
+      this: *mut cef_request_handler_t, browser: *mut interfaces::cef_browser_t,
+      url: *const types::cef_string_t, policy_url: *const types::cef_string_t,
+      info: *mut interfaces::cef_web_plugin_info_t) -> libc::c_int>,
+
+  //
+  // Called on the browser process UI thread when a plugin has crashed.
+  // |plugin_path| is the path of the plugin that crashed.
+  //
+  pub on_plugin_crashed: Option<extern "C" fn(this: *mut cef_request_handler_t,
+      browser: *mut interfaces::cef_browser_t,
+      plugin_path: *const types::cef_string_t) -> ()>,
+
+  //
+  // Called on the browser process UI thread when the render process terminates
+  // unexpectedly. |status| indicates how the process terminated.
+  //
+  pub on_render_process_terminated: Option<extern "C" fn(
+      this: *mut cef_request_handler_t, browser: *mut interfaces::cef_browser_t,
+      status: types::cef_termination_status_t) -> ()>,
+
+  //
+  // The reference count. This will only be present for Rust instances!
+  //
+  ref_count: uint,
+
+  //
+  // Extra data. This will only be present for Rust instances!
+  //
+  pub extra: u8,
+} 
+
+pub type cef_request_handler_t = _cef_request_handler_t;
+
+
+//
+// Implement this structure to handle events related to browser requests. The
+// functions of this structure will be called on the thread indicated.
+//
+pub struct CefRequestHandler {
+  c_object: *mut cef_request_handler_t,
+}
+
+impl Clone for CefRequestHandler {
+  fn clone(&self) -> CefRequestHandler{
+    unsafe {
+      if !self.c_object.is_null() {
+        ((*self.c_object).base.add_ref.unwrap())(&mut (*self.c_object).base);
+      }
+      CefRequestHandler {
+        c_object: self.c_object,
+      }
+    }
+  }
+}
+
+impl Drop for CefRequestHandler {
+  fn drop(&mut self) {
+    unsafe {
+      if !self.c_object.is_null() {
+        ((*self.c_object).base.release.unwrap())(&mut (*self.c_object).base);
+      }
+    }
+  }
+}
+
+impl CefRequestHandler {
+  pub unsafe fn from_c_object(c_object: *mut cef_request_handler_t) -> CefRequestHandler {
+    CefRequestHandler {
+      c_object: c_object,
+    }
+  }
+
+  pub unsafe fn from_c_object_addref(c_object: *mut cef_request_handler_t) -> CefRequestHandler {
+    if !c_object.is_null() {
+      ((*c_object).base.add_ref.unwrap())(&mut (*c_object).base);
+    }
+    CefRequestHandler {
+      c_object: c_object,
+    }
+  }
+
+  pub fn c_object(&self) -> *mut cef_request_handler_t {
+    self.c_object
+  }
+
+  pub fn c_object_addrefed(&self) -> *mut cef_request_handler_t {
+    unsafe {
+      if !self.c_object.is_null() {
+        eutil::add_ref(self.c_object as *mut types::cef_base_t);
+      }
+      self.c_object
+    }
+  }
+
+  pub fn is_null_cef_object(&self) -> bool {
+    self.c_object.is_null()
+  }
+  pub fn is_not_null_cef_object(&self) -> bool {
+    !self.c_object.is_null()
+  }
+
+  //
+  // Called on the UI thread before browser navigation. Return true (1) to
+  // cancel the navigation or false (0) to allow the navigation to proceed. The
+  // |request| object cannot be modified in this callback.
+  // cef_load_handler_t::OnLoadingStateChange will be called twice in all cases.
+  // If the navigation is allowed cef_load_handler_t::OnLoadStart and
+  // cef_load_handler_t::OnLoadEnd will be called. If the navigation is canceled
+  // cef_load_handler_t::OnLoadError will be called with an |errorCode| value of
+  // ERR_ABORTED.
+  //
+  pub fn on_before_browse(&self, browser: interfaces::CefBrowser,
+      frame: interfaces::CefFrame, request: interfaces::CefRequest,
+      is_redirect: libc::c_int) -> libc::c_int {
+    if self.c_object.is_null() {
+      panic!("called a CEF method on a null object")
+    }
+    unsafe {
+      CefWrap::to_rust(
+        ((*self.c_object).on_before_browse.unwrap())(
+          self.c_object,
+          CefWrap::to_c(browser),
+          CefWrap::to_c(frame),
+          CefWrap::to_c(request),
+          CefWrap::to_c(is_redirect)))
+    }
+  }
+
+  //
+  // Called on the IO thread before a resource request is loaded. The |request|
+  // object may be modified. To cancel the request return true (1) otherwise
+  // return false (0).
+  //
+  pub fn on_before_resource_load(&self, browser: interfaces::CefBrowser,
+      frame: interfaces::CefFrame,
+      request: interfaces::CefRequest) -> libc::c_int {
+    if self.c_object.is_null() {
+      panic!("called a CEF method on a null object")
+    }
+    unsafe {
+      CefWrap::to_rust(
+        ((*self.c_object).on_before_resource_load.unwrap())(
+          self.c_object,
+          CefWrap::to_c(browser),
+          CefWrap::to_c(frame),
+          CefWrap::to_c(request)))
+    }
+  }
+
+  //
+  // Called on the IO thread before a resource is loaded. To allow the resource
+  // to load normally return NULL. To specify a handler for the resource return
+  // a cef_resource_handler_t object. The |request| object should not be
+  // modified in this callback.
+  //
+  pub fn get_resource_handler(&self, browser: interfaces::CefBrowser,
+      frame: interfaces::CefFrame,
+      request: interfaces::CefRequest) -> interfaces::CefResourceHandler {
+    if self.c_object.is_null() {
+      panic!("called a CEF method on a null object")
+    }
+    unsafe {
+      CefWrap::to_rust(
+        ((*self.c_object).get_resource_handler.unwrap())(
+          self.c_object,
+          CefWrap::to_c(browser),
+          CefWrap::to_c(frame),
+          CefWrap::to_c(request)))
+    }
+  }
+
+  //
+  // Called on the IO thread when a resource load is redirected. The |old_url|
+  // parameter will contain the old URL. The |new_url| parameter will contain
+  // the new URL and can be changed if desired.
+  //
+  pub fn on_resource_redirect(&self, browser: interfaces::CefBrowser,
+      frame: interfaces::CefFrame, old_url: &str,
+      new_url: *mut types::cef_string_t) -> () {
+    if self.c_object.is_null() {
+      panic!("called a CEF method on a null object")
+    }
+    unsafe {
+      CefWrap::to_rust(
+        ((*self.c_object).on_resource_redirect.unwrap())(
+          self.c_object,
+          CefWrap::to_c(browser),
+          CefWrap::to_c(frame),
+          CefWrap::to_c(old_url),
+          CefWrap::to_c(new_url)))
+    }
+  }
+
+  //
+  // Called on the IO thread when the browser needs credentials from the user.
+  // |isProxy| indicates whether the host is a proxy server. |host| contains the
+  // hostname and |port| contains the port number. Return true (1) to continue
+  // the request and call cef_auth_callback_t::cont() when the authentication
+  // information is available. Return false (0) to cancel the request.
+  //
+  pub fn get_auth_credentials(&self, browser: interfaces::CefBrowser,
+      frame: interfaces::CefFrame, isProxy: libc::c_int, host: &str,
+      port: libc::c_int, realm: &str, scheme: &str,
+      callback: interfaces::CefAuthCallback) -> libc::c_int {
+    if self.c_object.is_null() {
+      panic!("called a CEF method on a null object")
+    }
+    unsafe {
+      CefWrap::to_rust(
+        ((*self.c_object).get_auth_credentials.unwrap())(
+          self.c_object,
+          CefWrap::to_c(browser),
+          CefWrap::to_c(frame),
+          CefWrap::to_c(isProxy),
+          CefWrap::to_c(host),
+          CefWrap::to_c(port),
+          CefWrap::to_c(realm),
+          CefWrap::to_c(scheme),
+          CefWrap::to_c(callback)))
+    }
+  }
+
+  //
+  // Called on the IO thread when JavaScript requests a specific storage quota
+  // size via the webkitStorageInfo.requestQuota function. |origin_url| is the
+  // origin of the page making the request. |new_size| is the requested quota
+  // size in bytes. Return true (1) and call cef_quota_callback_t::cont() either
+  // in this function or at a later time to grant or deny the request. Return
+  // false (0) to cancel the request.
+  //
+  pub fn on_quota_request(&self, browser: interfaces::CefBrowser,
+      origin_url: &str, new_size: i64,
+      callback: interfaces::CefQuotaCallback) -> libc::c_int {
+    if self.c_object.is_null() {
+      panic!("called a CEF method on a null object")
+    }
+    unsafe {
+      CefWrap::to_rust(
+        ((*self.c_object).on_quota_request.unwrap())(
+          self.c_object,
+          CefWrap::to_c(browser),
+          CefWrap::to_c(origin_url),
+          CefWrap::to_c(new_size),
+          CefWrap::to_c(callback)))
+    }
+  }
+
+  //
+  // Called on the UI thread to handle requests for URLs with an unknown
+  // protocol component. Set |allow_os_execution| to true (1) to attempt
+  // execution via the registered OS protocol handler, if any. SECURITY WARNING:
+  // YOU SHOULD USE THIS METHOD TO ENFORCE RESTRICTIONS BASED ON SCHEME, HOST OR
+  // OTHER URL ANALYSIS BEFORE ALLOWING OS EXECUTION.
+  //
+  pub fn on_protocol_execution(&self, browser: interfaces::CefBrowser,
+      url: &str, allow_os_execution: &mut libc::c_int) -> () {
+    if self.c_object.is_null() {
+      panic!("called a CEF method on a null object")
+    }
+    unsafe {
+      CefWrap::to_rust(
+        ((*self.c_object).on_protocol_execution.unwrap())(
+          self.c_object,
+          CefWrap::to_c(browser),
+          CefWrap::to_c(url),
+          CefWrap::to_c(allow_os_execution)))
+    }
+  }
+
+  //
+  // Called on the UI thread to handle requests for URLs with an invalid SSL
+  // certificate. Return true (1) and call
+  // cef_allow_certificate_error_callback_t:: cont() either in this function or
+  // at a later time to continue or cancel the request. Return false (0) to
+  // cancel the request immediately. If |callback| is NULL the error cannot be
+  // recovered from and the request will be canceled automatically. If
+  // CefSettings.ignore_certificate_errors is set all invalid certificates will
+  // be accepted without calling this function.
+  //
+  pub fn on_certificate_error(&self, cert_error: types::cef_errorcode_t,
+      request_url: &str,
+      callback: interfaces::CefAllowCertificateErrorCallback) -> libc::c_int {
+    if self.c_object.is_null() {
+      panic!("called a CEF method on a null object")
+    }
+    unsafe {
+      CefWrap::to_rust(
+        ((*self.c_object).on_certificate_error.unwrap())(
+          self.c_object,
+          CefWrap::to_c(cert_error),
+          CefWrap::to_c(request_url),
+          CefWrap::to_c(callback)))
+    }
+  }
+
+  //
+  // Called on the browser process IO thread before a plugin is loaded. Return
+  // true (1) to block loading of the plugin.
+  //
+  pub fn on_before_plugin_load(&self, browser: interfaces::CefBrowser,
+      url: &str, policy_url: &str,
+      info: interfaces::CefWebPluginInfo) -> libc::c_int {
+    if self.c_object.is_null() {
+      panic!("called a CEF method on a null object")
+    }
+    unsafe {
+      CefWrap::to_rust(
+        ((*self.c_object).on_before_plugin_load.unwrap())(
+          self.c_object,
+          CefWrap::to_c(browser),
+          CefWrap::to_c(url),
+          CefWrap::to_c(policy_url),
+          CefWrap::to_c(info)))
+    }
+  }
+
+  //
+  // Called on the browser process UI thread when a plugin has crashed.
+  // |plugin_path| is the path of the plugin that crashed.
+  //
+  pub fn on_plugin_crashed(&self, browser: interfaces::CefBrowser,
+      plugin_path: &str) -> () {
+    if self.c_object.is_null() {
+      panic!("called a CEF method on a null object")
+    }
+    unsafe {
+      CefWrap::to_rust(
+        ((*self.c_object).on_plugin_crashed.unwrap())(
+          self.c_object,
+          CefWrap::to_c(browser),
+          CefWrap::to_c(plugin_path)))
+    }
+  }
+
+  //
+  // Called on the browser process UI thread when the render process terminates
+  // unexpectedly. |status| indicates how the process terminated.
+  //
+  pub fn on_render_process_terminated(&self, browser: interfaces::CefBrowser,
+      status: types::cef_termination_status_t) -> () {
+    if self.c_object.is_null() {
+      panic!("called a CEF method on a null object")
+    }
+    unsafe {
+      CefWrap::to_rust(
+        ((*self.c_object).on_render_process_terminated.unwrap())(
+          self.c_object,
+          CefWrap::to_c(browser),
+          CefWrap::to_c(status)))
+    }
+  }
+} 
+
+impl CefWrap<*mut cef_request_handler_t> for CefRequestHandler {
+  fn to_c(rust_object: CefRequestHandler) -> *mut cef_request_handler_t {
+    rust_object.c_object_addrefed()
+  }
+  unsafe fn to_rust(c_object: *mut cef_request_handler_t) -> CefRequestHandler {
+    CefRequestHandler::from_c_object_addref(c_object)
+  }
+}
+impl CefWrap<*mut cef_request_handler_t> for Option<CefRequestHandler> {
+  fn to_c(rust_object: Option<CefRequestHandler>) -> *mut cef_request_handler_t {
+    match rust_object {
+      None => ptr::null_mut(),
+      Some(rust_object) => rust_object.c_object_addrefed(),
+    }
+  }
+  unsafe fn to_rust(c_object: *mut cef_request_handler_t) -> Option<CefRequestHandler> {
+    if c_object.is_null() {
+      None
+    } else {
+      Some(CefRequestHandler::from_c_object_addref(c_object))
+    }
+  }
+}
+