webdriver: Move NewWebView, FocusWebView, GetWindowSize, and SetWindowSize to servoshell (#37555)

Follow up to: https://github.com/servo/servo/pull/36714
Moving webdriver [context
commands](https://www.w3.org/TR/webdriver2/#contexts) to be handled in
embedder:

- [x] New Window command - `WebdriverCommandMsg::NewWebView`
- [x]  Switch To Window command - `WebdriverCommandMsg::FocusWebView`
- [x] Resizing commands

cc: @xiaochengh

---------

Signed-off-by: batu_hoang <longvatrong111@gmail.com>

components/shared/embedder/webdriver.rs

@@ -20,7 +20,7 @@ use servo_url::ServoUrl;
 use style_traits::CSSPixel;
 use webdriver::common::{WebElement, WebFrame, WebWindow};
 use webdriver::error::ErrorStatus;
-use webrender_api::units::DeviceIntSize;
+use webrender_api::units::{DeviceIntSize, DevicePixel};
 
 use crate::{MouseButton, MouseButtonAction};
 
@@ -31,7 +31,9 @@ pub struct WebDriverMessageId(pub usize);
 #[derive(Debug, Deserialize, Serialize)]
 pub enum WebDriverCommandMsg {
     /// Get the window size.
-    GetWindowSize(WebViewId, IpcSender<Size2D<f32, CSSPixel>>),
+    GetWindowSize(WebViewId, IpcSender<Size2D<i32, DevicePixel>>),
+    /// Get the viewport size.
+    GetViewportSize(WebViewId, IpcSender<Size2D<f32, CSSPixel>>),
     /// Load a URL in the top-level browsing context with the given ID.
     LoadUrl(WebViewId, ServoUrl, IpcSender<WebDriverLoadStatus>),
     /// Refresh the top-level browsing context with the given ID.
@@ -83,7 +85,11 @@ pub enum WebDriverCommandMsg {
         IpcSender<WebDriverCommandResponse>,
     ),
     /// Set the window size.
-    SetWindowSize(WebViewId, DeviceIntSize, IpcSender<Size2D<f32, CSSPixel>>),
+    SetWindowSize(
+        WebViewId,
+        DeviceIntSize,
+        IpcSender<Size2D<i32, DevicePixel>>,
+    ),
     /// Take a screenshot of the window.
     TakeScreenshot(
         WebViewId,
@@ -94,15 +100,13 @@ pub enum WebDriverCommandMsg {
     /// the provided channels to return the top level browsing context id
     /// associated with the new webview, and a notification when the initial
     /// load is complete.
-    NewWebView(
-        WebViewId,
-        IpcSender<WebViewId>,
-        IpcSender<WebDriverLoadStatus>,
-    ),
+    NewWebView(IpcSender<WebViewId>, IpcSender<WebDriverLoadStatus>),
     /// Close the webview associated with the provided id.
     CloseWebView(WebViewId),
     /// Focus the webview associated with the provided id.
     FocusWebView(WebViewId),
+    /// Get focused webview.
+    GetFocusedWebView(IpcSender<Option<WebViewId>>),
     /// Check whether top-level browsing context is open.
     IsWebViewOpen(WebViewId, IpcSender<bool>),
     /// Check whether browsing context is open.