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 843529b282b8b3568d18aa143f407fd5200d4e06..308abd445fa9d703f03e2e322813372746d6277a 100644
--- a/android_webview/browser/browser_view_renderer.h
+++ b/android_webview/browser/browser_view_renderer.h
@@ -96,7 +96,7 @@ 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,
@@ -116,12 +116,13 @@ 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.
-  void EnsureContinuousInvalidation(bool force_invalidate);
+  // 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.
+  void PostInvalidateWithFallback();
+  void CancelFallbackTick();
+  void UpdateCompositorIsActive();
   bool CompositeSW(SkCanvas* canvas);
-  void DidComposite();
   scoped_refptr<base::trace_event::ConvertableToTraceFormat>
   RootLayerStateAsValue(const gfx::Vector2dF& total_scroll_offset_dip,
                         const gfx::SizeF& scrollable_size_dip);
@@ -145,6 +146,7 @@ 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;
@@ -170,14 +172,6 @@ class BrowserViewRenderer : public content::SynchronousCompositorClient {
   gfx::Vector2d last_on_draw_scroll_offset_;
   gfx::Rect last_on_draw_global_visible_rect_;
 
-  // 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 block additional invalidates while one is already pending.
-  bool block_invalidates_;
 
   base::CancelableClosure post_fallback_tick_;
   base::CancelableClosure fallback_tick_fired_;