cc: Eliminate tile.h's dependency on tile_manager.h

cc/resources/tile.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_RESOURCES_TILE_H_
 #define CC_RESOURCES_TILE_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "cc/resources/managed_tile_state.h"
-#include "cc/resources/picture_pile_impl.h"
-#include "cc/resources/tile_manager.h"
+#include "cc/resources/raster_mode.h"
 #include "cc/resources/tile_priority.h"
-#include "cc/trees/layer_tree_host_impl.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
 namespace cc {
 
+class PicturePileImpl;
 class Tile;
 
 class CC_EXPORT Tile : public base::RefCounted<Tile> {
  public:
   Tile(TileManager* tile_manager,
        PicturePileImpl* picture_pile,
        gfx::Size tile_size,
        gfx::Rect content_rect,
        gfx::Rect opaque_rect,
        float contents_scale,
@@ skipping 120 matching lines @@
   int layer_id_;
   int source_frame_number_;
   bool can_use_lcd_text_;
 
   DISALLOW_COPY_AND_ASSIGN(Tile);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_H_