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

android_webview/browser/browser_view_renderer_client.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_CLIENT_H_
 #define ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_CLIENT_H_
 
 #include "base/android/scoped_java_ref.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/size_f.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 
 namespace android_webview {
 struct ParentCompositorDrawConstraints;
 
 class BrowserViewRendererClient {
  public:
   // Request DrawGL to be in called AwDrawGLInfo::kModeProcess type.
   // |wait_for_completion| will cause the call to block until DrawGL has
   // happened. The callback may never be made, and the mode may be promoted to
   // kModeDraw.
   virtual bool RequestDrawGL(bool wait_for_completion) = 0;
 
   // Called when a new Picture is available. Needs to be enabled
   // via the EnableOnNewPicture method.
   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
   // synchronize draw functor destruction.
   virtual void DetachFunctorFromView() = 0;
 
   // Called to get view's absolute location on the screen.
   virtual gfx::Point GetLocationOnScreen() = 0;
 
   // Try to set the view's scroll offset to |new_value|.
@@ skipping 22 matching lines @@
   virtual void ParentDrawConstraintsUpdated(
       const ParentCompositorDrawConstraints& draw_constraints) = 0;
 
  protected:
   virtual ~BrowserViewRendererClient() {}
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_CLIENT_H_