cc: Do not cleanup tiles with raster tasks.

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"
@@ skipping 150 matching lines @@
   // Methods called by by tile manager.
   Tile(TileManager* tile_manager,
        PicturePileImpl* picture_pile,
        const gfx::Size& tile_size,
        const gfx::Rect& content_rect,
        const gfx::Rect& opaque_rect,
        float contents_scale,
        int layer_id,
        int source_frame_number,
        int flags);
+

[reveman, 2014/08/01 14:13:14]

Nit: no need to add this blank line

[sohanjg, 2014/08/04 06:25:03]

Done.

   ~Tile();
 
   ManagedTileState& managed_state() { return managed_state_; }
   const ManagedTileState& managed_state() const { return managed_state_; }
   RasterMode DetermineRasterModeForResolution(TileResolution resolution) const;
 
+  bool HasRasterTask() const;
+
   TileManager* tile_manager_;
   scoped_refptr<PicturePileImpl> picture_pile_;
   gfx::Rect tile_size_;
   gfx::Rect content_rect_;
   float contents_scale_;
   gfx::Rect opaque_rect_;
   bool is_occluded_[NUM_TREES];
 
   TilePriority priority_[NUM_TREES];
   ManagedTileState managed_state_;
   int layer_id_;
   int source_frame_number_;
   int flags_;
 
   Id id_;
   static Id s_next_id_;
 
   DISALLOW_COPY_AND_ASSIGN(Tile);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_H_