Auto merge of #12663 - izgzhen:file-reader-sync, r=Manishearth

Add FileReaderSync skeleton

Add a FileReaderSync interface skeleton, no concrete implementation yet.

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- [x] `./mach test-tidy` does not report any errors
- [x] There are tests for these changes OR

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components/script/dom/filereadersync.rs

@@ -0,0 +1,34 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use dom::bindings::codegen::Bindings::FileReaderSyncBinding;
+use dom::bindings::error::Fallible;
+use dom::bindings::global::GlobalRef;
+use dom::bindings::js::Root;
+use dom::bindings::reflector::reflect_dom_object;
+use dom::eventtarget::EventTarget;
+
+
+
+#[dom_struct]
+pub struct FileReaderSync {
+    eventtarget: EventTarget
+}
+
+impl FileReaderSync {
+    pub fn new_inherited() -> FileReaderSync {
+        FileReaderSync {
+            eventtarget: EventTarget::new_inherited(),
+        }
+    }
+
+    pub fn new(global: GlobalRef) -> Root<FileReaderSync> {
+        reflect_dom_object(box FileReaderSync::new_inherited(),
+                           global, FileReaderSyncBinding::Wrap)
+    }
+
+    pub fn Constructor(global: GlobalRef) -> Fallible<Root<FileReaderSync>> {
+        Ok(FileReaderSync::new(global))
+    }
+}

components/script/dom/mod.rs

@@ -265,6 +265,7 @@ pub mod eventtarget;
 pub mod file;
 pub mod filelist;
 pub mod filereader;
+pub mod filereadersync;
 pub mod focusevent;
 pub mod forcetouchevent;
 pub mod formdata;

components/script/dom/webidls/FileReaderSync.webidl

@@ -0,0 +1,15 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// https://w3c.github.io/FileAPI/#FileReaderSync
+
+[Constructor, Exposed=Worker]
+interface FileReaderSync {
+  // Synchronously return strings
+
+  // ArrayBuffer readAsArrayBuffer(Blob blob);
+  // DOMString readAsBinaryString(Blob blob);
+  // DOMString readAsText(Blob blob, optional DOMString label);
+  // DOMString readAsDataURL(Blob blob);
+};