cc: Remove tile ref counting in tile manager.

cc/resources/tile.cc

 // 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.
 
 #include "cc/resources/tile.h"
 
 #include "cc/debug/traced_value.h"
 #include "cc/resources/tile_manager.h"
 #include "third_party/khronos/GLES2/gl2.h"
 
 namespace cc {
 
+Tile::Id Tile::s_next_id_ = 0;
+
 Tile::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)
   : tile_manager_(tile_manager),
     tile_size_(tile_size),
     content_rect_(content_rect),
     contents_scale_(contents_scale),
     opaque_rect_(opaque_rect),
     layer_id_(layer_id),
     source_frame_number_(source_frame_number),
-    can_use_lcd_text_(can_use_lcd_text) {
+    can_use_lcd_text_(can_use_lcd_text),
+    id_(s_next_id_++) {
   set_picture_pile(picture_pile);
   tile_manager_->RegisterTile(this);
 }
 
 Tile::~Tile() {
   TRACE_EVENT_OBJECT_DELETED_WITH_ID(
       TRACE_DISABLED_BY_DEFAULT("cc.debug"), "cc::Tile", this);
   tile_manager_->UnregisterTile(this);
 }
 
@@ skipping 10 matching lines @@
 }
 
 size_t Tile::GPUMemoryUsageInBytes() const {
   size_t total_size = 0;
   for (int mode = 0; mode < NUM_RASTER_MODES; ++mode)
     total_size += managed_state_.tile_versions[mode].GPUMemoryUsageInBytes();
   return total_size;
 }
 
 }  // namespace cc