cc: Partial tile update for one-copy raster.

cc/tiles/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_TILES_TILE_H_
 #define CC_TILES_TILE_H_
 
 #include "base/memory/ref_counted.h"
 #include "cc/tiles/tile_draw_info.h"
 #include "ui/gfx/geometry/rect.h"
@@ skipping 50 matching lines @@
 
   gfx::Size desired_texture_size() const { return desired_texture_size_; }
 
   void set_tiling_index(int i, int j) {
     tiling_i_index_ = i;
     tiling_j_index_ = j;
   }
   int tiling_i_index() const { return tiling_i_index_; }
   int tiling_j_index() const { return tiling_j_index_; }
 
+  void SetInvalidated(const gfx::Rect& invalid_content_rect,
+                      Id previous_tile_id) {
+    invalidated_content_rect_ = invalid_content_rect;
+    invalidated_id_ = previous_tile_id;
+  }
+
+  Id invalidated_id() const { return invalidated_id_; }
+  const gfx::Rect& invalidated_content_rect() const {
+    return invalidated_content_rect_;
+  }
+
  private:
   friend class TileManager;
   friend class FakeTileManager;
   friend class FakePictureLayerImpl;
 
   // Methods called by by tile manager.
   Tile(TileManager* tile_manager,
        const gfx::Size& desired_texture_size,
        const gfx::Rect& content_rect,
        float contents_scale,
@@ skipping 15 matching lines @@
   int source_frame_number_;
   int flags_;
   int tiling_i_index_;
   int tiling_j_index_;
   bool required_for_activation_ : 1;
   bool required_for_draw_ : 1;
 
   Id id_;
   static Id s_next_id_;
 
+  // The rect bounding the changes in this Tile vs the previous tile it
+  // replaced.
+  gfx::Rect invalidated_content_rect_;
+  // The |id_| of the Tile that was invalidated and replaced by this tile.
+  Id invalidated_id_;
+
   unsigned scheduled_priority_;
 
   scoped_refptr<RasterTask> raster_task_;
 
   DISALLOW_COPY_AND_ASSIGN(Tile);
 };
 
 using ScopedTilePtr = scoped_ptr<Tile, Tile::Deleter>;
 
 }  // namespace cc
 
 #endif  // CC_TILES_TILE_H_