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"
 #include "cc/base/ref_counted_managed.h"
 #include "cc/resources/managed_tile_state.h"
 #include "cc/resources/picture_pile_impl.h"
 #include "cc/resources/raster_mode.h"
 #include "cc/resources/tile_priority.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
 namespace cc {
 
 class CC_EXPORT Tile : public RefCountedManaged<Tile> {
  public:
+  // Needed by ScopedVector for deleting released tiles.
+  ~Tile();

[reveman, 2014/07/30 14:24:01]

This is really inappropriate for a ref counted type. I'm going to try refactor
RefCountedManaged so this is not necessary.

[sohanjg, 2014/07/30 17:27:04]

Acknowledged.

+
   enum TileRasterFlags { USE_PICTURE_ANALYSIS = 1 << 0 };
 
   typedef uint64 Id;
 
   Id id() const {
     return id_;
   }
 
   PicturePileImpl* picture_pile() {
     return picture_pile_.get();
@@ skipping 128 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);
-  ~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_