Move fallback tick handling to compositor thread

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 9cb80c715ec950e4589e184cdbfeaeab927c1819..60ba7022ef9eca48189e86e11bcd656e018c85c4 100644
--- a/android_webview/browser/browser_view_renderer.h
+++ b/android_webview/browser/browser_view_renderer.h
@@ -126,33 +126,15 @@ class BrowserViewRenderer : public content::SynchronousCompositorClient {
  private:
   void SetTotalRootLayerScrollOffset(const gfx::Vector2dF& new_value_dip);
   bool CanOnDraw();
-  // 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);
   scoped_ptr<base::trace_event::ConvertableToTraceFormat> RootLayerStateAsValue(
       const gfx::Vector2dF& total_scroll_offset_dip,
       const gfx::SizeF& scrollable_size_dip);
 
-  bool CompositeHw();
   void ReturnUnusedResource(scoped_ptr<ChildFrame> frame);
   void ReturnResourceFromParent();
 
-  // If we call up view invalidate and OnDraw is not called before a deadline,
-  // then we keep ticking the SynchronousCompositor so it can make progress.
-  // Do this in a two stage tick due to native MessageLoop favors delayed task,
-  // so ensure delayed task is inserted only after the draw task returns.
-  void PostFallbackTick();
-  void FallbackTickFired();
-
-  // Force invoke the compositor to run produce a 1x1 software frame that is
-  // immediately discarded. This is a hack to force invoke parts of the
-  // compositor that are not directly exposed here.
-  void ForceFakeCompositeSW();
-
   gfx::Vector2d max_scroll_offset() const;
 
   void UpdateMemoryPolicy();
@@ -191,10 +173,6 @@ class BrowserViewRenderer : public content::SynchronousCompositorClient {
   gfx::Vector2d last_on_draw_scroll_offset_;
   gfx::Rect last_on_draw_global_visible_rect_;
 
-  base::CancelableClosure post_fallback_tick_;
-  base::CancelableClosure fallback_tick_fired_;
-  bool fallback_tick_pending_;
-
   gfx::Size size_;
 
   gfx::SizeF scrollable_size_dip_;