[cc] Tiles and tile manager for impl side painting

cc/tile_manager.h

+// Copyright 2012 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_TILE_MANAGER_H_
+#define CC_TILE_MANAGER_H_
+
+#include <vector>
+
+namespace cc {
+
+class Tile;
+class ResourceProvider;
+
+class TileManagerClient {
+ public:
+  virtual void ScheduleManage() = 0;
+
+ protected:
+  ~TileManagerClient() { }
+};
+
+// This class manages tiles, deciding which should get rasterized and which
+// should no longer have any memory assigned to them. Tile objects are "owned"
+// by layers; they automatically register with the manager when they are
+// created, and unregister from the manager when they are deleted.
+class TileManager {
+ public:
+  TileManager(TileManagerClient* client);
+  ~TileManager();
+  void Manage() { }
+
+ protected:
+  // Methods called by Tile
+  void RegisterTile(Tile*);
+  void UnregisterTile(Tile*);
+
+ private:
+  friend class Tile;
+
+  TileManagerClient* client_;
+  std::vector<Tile*> registered_tiles_;
+};
+
+}
+
+#endif