cc: Make scheduling be driven by vsync for android webview.

android_webview/native/aw_contents.h

Index: android_webview/native/aw_contents.h
diff --git a/android_webview/native/aw_contents.h b/android_webview/native/aw_contents.h
index 4a4afbbe981f25b935f9bc46690c6ee6b8fa4a4e..0b216dd57d1bef5de4d2d721539e06b42e9cb1d0 100644
--- a/android_webview/native/aw_contents.h
+++ b/android_webview/native/aw_contents.h
@@ -22,6 +22,7 @@
 #include "base/android/scoped_java_ref.h"
 #include "base/callback_forward.h"
 #include "base/memory/scoped_ptr.h"
+#include "ui/base/android/window_android_observer.h"
 
 class SkBitmap;
 class TabContents;
@@ -58,7 +59,8 @@ class AwContents : public FindHelper::Listener,
                    public AwRenderViewHostExtClient,
                    public BrowserViewRendererClient,
                    public PermissionRequestHandlerClient,
-                   public AwBrowserPermissionRequestDelegate {
+                   public AwBrowserPermissionRequestDelegate,
+                   public WindowAndroidObserver {
  public:
   // Returns the AwContents instance associated with |web_contents|, or NULL.
   static AwContents* FromWebContents(content::WebContents* web_contents);
@@ -203,9 +205,17 @@ class AwContents : public FindHelper::Listener,
                                  float min_page_scale_factor,
                                  float max_page_scale_factor) override;
   virtual void DidOverscroll(gfx::Vector2d overscroll_delta) override;
+  virtual void RequestVSyncUpdate() override;
 
   const BrowserViewRenderer* GetBrowserViewRenderer() const;
 
+  // WindowAndroidObserver implementation.
+  virtual void OnCompositingDidCommit() override {}
+  virtual void OnAttachCompositor() override {}
+  virtual void OnDetachCompositor() override {}
+  virtual void OnVSync(base::TimeTicks frame_time,
+      base::TimeDelta vsync_period) override;
+
   void ClearCache(JNIEnv* env, jobject obj, jboolean include_disk_files);
   void SetPendingWebContentsForPopup(scoped_ptr<content::WebContents> pending);
   jlong ReleasePopupAwContents(JNIEnv* env, jobject obj);