Reduce tile memory size

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 <algorithm>
 
 #include "base/debug/trace_event_argument.h"
 #include "cc/base/math_util.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,
            RasterSource* raster_source,
            const gfx::Size& tile_size,
            const gfx::Rect& content_rect,
            float contents_scale,
            int layer_id,
            int source_frame_number,
            int flags)
     : RefCountedManaged<Tile>(tile_manager),
-      tile_manager_(tile_manager),
       size_(tile_size),
       content_rect_(content_rect),
       contents_scale_(contents_scale),
       layer_id_(layer_id),
       source_frame_number_(source_frame_number),
       flags_(flags),
-      is_shared_(false),
       tiling_i_index_(-1),
       tiling_j_index_(-1),
+      is_shared_(false),
       required_for_activation_(false),
       required_for_draw_(false),
       id_(s_next_id_++),
       scheduled_priority_(0) {
   set_raster_source(raster_source);
   for (int i = 0; i < NUM_TREES; i++)
     is_occluded_[i] = false;
 }
 
 Tile::~Tile() {
@@ skipping 38 matching lines @@
   res->SetInteger("gpu_memory_usage", GPUMemoryUsageInBytes());
 }
 
 size_t Tile::GPUMemoryUsageInBytes() const {
   if (draw_info_.resource_)
     return draw_info_.resource_->bytes();
   return 0;
 }
 
 }  // namespace cc