cc: Only register live tiles with the TileManager

cc/tile_manager.h

Index: cc/tile_manager.h
diff --git a/cc/tile_manager.h b/cc/tile_manager.h
index 3d198bd40c974b45baf391571365c65561d91442..9338b148134811980ce8d8bcd7e7eeba522cbc4c 100644
--- a/cc/tile_manager.h
+++ b/cc/tile_manager.h
@@ -78,11 +78,12 @@ class CC_EXPORT ManagedTileState : public base::RefCounted<ManagedTileState> {
  public:
   ManagedTileState(Tile* tile);
   scoped_ptr<base::Value> AsValue() const;
+  bool can_be_freed() const { return !cannot_be_freed_ref.get(); }
 
   // Persisted state: valid all the time.
   scoped_refptr<Tile> tile;
   bool can_use_gpu_memory;
-  bool can_be_freed;
+  scoped_refptr<ManagedTileState> cannot_be_freed_ref;
   scoped_ptr<ResourcePool::Resource> resource;
   bool resource_is_being_initialized;
   bool contents_swizzled;
@@ -187,7 +188,6 @@ class CC_EXPORT TileManager : public WorkerPoolClient {
       scoped_refptr<ManagedTileState> tile,
       scoped_ptr<ResourcePool::Resource> resource,
       int manage_tiles_call_count_when_dispatched);
-  void DidFinishTileInitialization(ManagedTileState* mts);
   void DidTileRasterStateChange(ManagedTileState* mts, TileRasterState state);
   void DidTileTreeBinChange(ManagedTileState* mts,
                             TileManagerBin new_tree_bin,