Reland (2): cc: Make tile manager object persist for the length of LTHI.

cc/trees/layer_tree_host_impl.h

 // Copyright 2011 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 CC_TREES_LAYER_TREE_HOST_IMPL_H_
 #define CC_TREES_LAYER_TREE_HOST_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 211 matching lines @@
   virtual void BeginMainFrameAborted(CommitEarlyOutReason reason);
   virtual void BeginCommit();
   virtual void CommitComplete();
   virtual void Animate(base::TimeTicks monotonic_time);
   virtual void UpdateAnimationState(bool start_ready_animations);
   void ActivateAnimations();
   void MainThreadHasStoppedFlinging();
   void DidAnimateScrollOffset();
   void SetViewportDamage(const gfx::Rect& damage_rect);
 
-  virtual void PrepareTiles();
+  virtual bool PrepareTiles();
 
   // Returns DRAW_SUCCESS unless problems occured preparing the frame, and we
   // should try to avoid displaying the frame. If PrepareToDraw is called,
   // DidDrawAllLayers must also be called, regardless of whether DrawLayers is
   // called between the two.
   virtual DrawResult PrepareToDraw(FrameData* frame);
   virtual void DrawLayers(FrameData* frame);
   // Must be called if and only if PrepareToDraw was called.
   void DidDrawAllLayers(const FrameData& frame);
 
@@ skipping 330 matching lines @@
 
   BeginFrameTracker current_begin_frame_tracker_;
 
  private:
   gfx::Vector2dF ScrollLayerWithViewportSpaceDelta(
       LayerImpl* layer_impl,
       const gfx::PointF& viewport_point,
       const gfx::Vector2dF& viewport_delta);
 
   void CreateAndSetRenderer();
-  void CreateAndSetTileManager();
-  void DestroyTileManager();
+  void CleanUpTileManager();
+  void RecreateTileManagerResources();
   void ReleaseTreeResources();
   void RecreateTreeResources();
 
   void UpdateGpuRasterizationStatus();
 
   bool IsSynchronousSingleThreaded() const;
 
   Viewport* viewport() { return viewport_.get(); }
 
   // Scroll by preferring to move the outer viewport first, only moving the
@@ skipping 185 matching lines @@
   scoped_ptr<FrameTimingTracker> frame_timing_tracker_;
 
   scoped_ptr<Viewport> viewport_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_