[Android WebView] Implement the capture picture API.

android_webview/renderer/aw_render_view_ext.h

Index: android_webview/renderer/aw_render_view_ext.h
diff --git a/android_webview/renderer/aw_render_view_ext.h b/android_webview/renderer/aw_render_view_ext.h
index 9fa91fdb538c80d5926174c900079476d3a74f3a..15acedc937f4d2234659dd33236c3ee58c0adb68 100644
--- a/android_webview/renderer/aw_render_view_ext.h
+++ b/android_webview/renderer/aw_render_view_ext.h
@@ -30,6 +30,9 @@ class AwRenderViewExt : public content::RenderViewObserver,
  public:
   static void RenderViewCreated(content::RenderView* render_view);
 
+  // Required to be public by IPC_MESSAGE_HANDLER_DELAY_REPLY.
+  using content::RenderViewObserver::Send;
+
  private:
   AwRenderViewExt(content::RenderView* render_view);
   virtual ~AwRenderViewExt();
@@ -48,6 +51,8 @@ class AwRenderViewExt : public content::RenderViewObserver,
 
   void OnPictureUpdate(skia::RefPtr<SkPicture> picture);
 
+  void OnCapturePictureSync(IPC::Message* reply_msg);
+
   // WebKit::WebPermissionClient implementation.
   virtual bool allowImage(WebKit::WebFrame* frame,
                           bool enabledPerSettings,