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 {
 
 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 InvalidateOnFunctorDestroy() = 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|.
   virtual void ScrollContainerViewTo(gfx::Vector2d new_value) = 0;
 
   // Is a Android view system managed fling in progress?
   virtual bool IsFlingActive() const = 0;
 
   // Sets the following:
   // view's scroll offset cap to |max_scroll_offset|,
   // current contents_size to |contents_size_dip|,
   // the current page scale to |page_scale_factor| and page scale limits
   // to |min_page_scale_factor|..|max_page_scale_factor|.
   virtual void UpdateScrollState(gfx::Vector2d max_scroll_offset,
                                  gfx::SizeF contents_size_dip,
                                  float page_scale_factor,
                                  float min_page_scale_factor,
                                  float max_page_scale_factor) = 0;
 
   // Handle overscroll.
   virtual void DidOverscroll(gfx::Vector2d overscroll_delta) = 0;
 
+  // Request a vsync update.
+  virtual void RequestVSyncUpdate() = 0;
+
  protected:
   virtual ~BrowserViewRendererClient() {}
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_CLIENT_H_