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

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index 48cbd7df4cdf42549f9bc7aef5a61cbde4f6d24f..f66f5b1de838ffcd499bdc4c3f945123973cbffc 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -265,7 +265,7 @@ class CC_EXPORT LayerTreeHostImpl
   void ScrollOffsetAnimationFinished() override;
   gfx::ScrollOffset GetScrollOffsetForAnimation(int layer_id) const override;
 
-  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,
@@ -617,8 +617,8 @@ class CC_EXPORT LayerTreeHostImpl
       const gfx::Vector2dF& viewport_delta);
 
   void CreateAndSetRenderer();
-  void CreateAndSetTileManager();
-  void DestroyTileManager();
+  void CleanUpTileManager();
+  void CreateTileManagerResources();
   void ReleaseTreeResources();
   void RecreateTreeResources();
 
@@ -700,7 +700,6 @@ class CC_EXPORT LayerTreeHostImpl
   scoped_ptr<OutputSurface> output_surface_;
 
   scoped_ptr<ResourceProvider> resource_provider_;
-  scoped_ptr<TileManager> tile_manager_;
   bool content_is_suitable_for_gpu_rasterization_;
   bool has_gpu_rasterization_trigger_;
   bool use_gpu_rasterization_;
@@ -748,6 +747,8 @@ class CC_EXPORT LayerTreeHostImpl
   bool visible_;
   ManagedMemoryPolicy cached_managed_memory_policy_;
 
+  scoped_ptr<TileManager> tile_manager_;
+
   gfx::Vector2dF accumulated_root_overscroll_;
 
   bool pinch_gesture_active_;