cc: Use CheckedNumeric for resource size calculations.

cc/tiles/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/tiles/tile.h"
 
 #include <algorithm>
 
 #include "base/trace_event/trace_event_argument.h"
 #include "cc/base/math_util.h"
@@ skipping 48 matching lines @@
 
   value->SetBoolean("has_resource", draw_info().has_resource());
   value->SetBoolean("is_using_gpu_memory",
                     draw_info().has_resource() || HasRasterTask());
   value->SetInteger("scheduled_priority", scheduled_priority_);
   value->SetBoolean("use_picture_analysis", use_picture_analysis());
   value->SetInteger("gpu_memory_usage", GPUMemoryUsageInBytes());
 }
 
 size_t Tile::GPUMemoryUsageInBytes() const {
-  if (draw_info_.resource_)
-    return draw_info_.resource_->bytes();
+  if (draw_info_.resource_) {
+    // We can use UncheckedSizeInBytes, since the tile size is determined by the
+    // compositor.
+    return Resource::UncheckedMemorySizeBytes(draw_info_.resource_->size(),
+                                              draw_info_.resource_->format());
+  }
   return 0;
 }
 
 void Tile::Deleter::operator()(Tile* tile) const {
   TileManager* tile_manager = tile->tile_manager_;
   tile_manager->Release(tile);
 }
 
 }  // namespace cc