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

android_webview/browser/browser_view_renderer_client.h

Index: android_webview/browser/browser_view_renderer_client.h
diff --git a/android_webview/browser/browser_view_renderer_client.h b/android_webview/browser/browser_view_renderer_client.h
index e87a27c598ad51318498aa0250214f9cffd00cc0..0b34f6b4fbdb0143fe810265f20d1937d64376d9 100644
--- a/android_webview/browser/browser_view_renderer_client.h
+++ b/android_webview/browser/browser_view_renderer_client.h
@@ -25,6 +25,8 @@ class BrowserViewRendererClient {
   virtual void OnNewPicture() = 0;
 
   // Called to trigger view invalidations.
+  // This calls postInvalidateOnAnimation if outside of a vsync, otherwise it
+  // calls invalidate.
   virtual void PostInvalidate() = 0;
 
   // Call postInvalidateOnAnimation for invalidations. This is only used to
@@ -54,6 +56,9 @@ class BrowserViewRendererClient {
   // Handle overscroll.
   virtual void DidOverscroll(gfx::Vector2d overscroll_delta) = 0;
 
+  // Request a vsync update.
+  virtual void RequestVSyncUpdate() = 0;
+
  protected:
   virtual ~BrowserViewRendererClient() {}
 };