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

android_webview/browser/browser_view_renderer.h

Index: android_webview/browser/browser_view_renderer.h
diff --git a/android_webview/browser/browser_view_renderer.h b/android_webview/browser/browser_view_renderer.h
index 784afb8714787f9da731153529c5cf04845ac7af..27d77f3785a2625948303a12ee9a1269cd3efb76 100644
--- a/android_webview/browser/browser_view_renderer.h
+++ b/android_webview/browser/browser_view_renderer.h
@@ -84,7 +84,7 @@ class BrowserViewRenderer : public content::SynchronousCompositorClient {
       content::SynchronousCompositor* compositor) override;
   void DidDestroyCompositor(
       content::SynchronousCompositor* compositor) override;
-  void SetContinuousInvalidate(bool invalidate) override;
+  void PostInvalidate() override;
   void DidUpdateContent() override;
   gfx::Vector2dF GetTotalRootLayerScrollOffset() override;
   void UpdateRootLayerState(const gfx::Vector2dF& total_scroll_offset_dip,
@@ -105,13 +105,12 @@ class BrowserViewRenderer : public content::SynchronousCompositorClient {
  private:
   void SetTotalRootLayerScrollOffset(gfx::Vector2dF new_value_dip);
   bool CanOnDraw();
-  // Checks the continuous invalidate and block invalidate state, and schedule
-  // invalidates appropriately. If |force_invalidate| is true, then send a view
-  // invalidate regardless of compositor expectation. If |skip_reschedule_tick|
-  // is true and if there is already a pending fallback tick, don't reschedule
-  // them.
-  void EnsureContinuousInvalidation(bool force_invalidate,
-                                    bool skip_reschedule_tick);
+  // Posts an invalidate with fallback tick. All invalidates posted while an
+  // invalidate is pending will be posted as a single invalidate after the
+  // pending invalidate is done. If |skip_reschedule_tick| is true a fallback
+  // tick won't be scheduled if there's one already pending.
+  void PostInvalidateWithFallback(bool skip_reschedule_tick);
+  void UpdateCompositorIsActive();
   bool CompositeSW(SkCanvas* canvas);
   void DidComposite();
   void DidSkipCompositeInDraw();
@@ -120,6 +119,7 @@ class BrowserViewRenderer : public content::SynchronousCompositorClient {
                         const gfx::SizeF& scrollable_size_dip);
 
   scoped_ptr<cc::CompositorFrame> CompositeHw();
+  void ForceCompositeHw();
   void ReturnUnusedResource(scoped_ptr<cc::CompositorFrame> frame);
   void ReturnResourceFromParent();
 
@@ -138,6 +138,7 @@ class BrowserViewRenderer : public content::SynchronousCompositorClient {
   gfx::Vector2d max_scroll_offset() const;
 
   size_t CalculateDesiredMemoryPolicy();
+
   // For debug tracing or logging. Return the string representation of this
   // view renderer's state.
   std::string ToString() const;
@@ -165,15 +166,10 @@ class BrowserViewRenderer : public content::SynchronousCompositorClient {
   // tiling priority.
   ParentCompositorDrawConstraints parent_draw_constraints_;
 
-  // When true, we should continuously invalidate and keep drawing, for example
-  // to drive animation. This value is set by the compositor and should always
-  // reflect the expectation of the compositor and not be reused for other
-  // states.
-  bool compositor_needs_continuous_invalidate_;
-
+  // Used to run invalidate after the pending invalidate is done.
   bool invalidate_after_composite_;
 
-  // Used to block additional invalidates while one is already pending.
+  // Used to block additional invalidates while one is pending.
   bool block_invalidates_;
 
   base::CancelableClosure post_fallback_tick_;