Added preliminary support for tile rasterization with Ganesh

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 42 matching lines @@
   }
 
   void set_can_use_lcd_text(bool can_use_lcd_text) {
     can_use_lcd_text_ = can_use_lcd_text;
   }
 
   bool can_use_lcd_text() const {
     return can_use_lcd_text_;
   }
 
+  bool use_gpu_rasterizer() const {

[nduca, 2013/12/02 19:50:17]

should this be mutable?

[slavi, 2013/12/04 02:06:50]

Done.

+    return use_gpu_rasterizer_;
+  }
+
   scoped_ptr<base::Value> AsValue() const;
 
   inline bool IsReadyToDraw() const {
     for (int mode = 0; mode < NUM_RASTER_MODES; ++mode) {
       if (managed_state_.tile_versions[mode].IsReadyToDraw())
         return true;
     }
     return false;
   }
 
@@ skipping 42 matching lines @@
 
   // Methods called by by tile manager.
   Tile(TileManager* tile_manager,
        PicturePileImpl* picture_pile,
        gfx::Size tile_size,
        gfx::Rect content_rect,
        gfx::Rect opaque_rect,
        float contents_scale,
        int layer_id,
        int source_frame_number,
-       bool can_use_lcd_text);
+       bool can_use_lcd_text,
+       bool use_gpu_rasterizer);

[nduca, 2013/12/02 19:50:17]

this is unreadable in the call sites. new Tile (..., true, false) means nothing.

please make an enum for TileRasterFlags { USE_GPU_RASTERIZER = 0x2, USE_LCD_TEXT
= 0x1 } and adjust call sites accordingly.

[slavi, 2013/12/04 02:06:50]

Done.

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