cc: Avoid expensive RenderingStats collection.

cc/raster_worker_pool.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/raster_worker_pool.h"
 
 #include "cc/picture_pile_impl.h"
 
 namespace cc {
 
 namespace {
 
 class RasterWorkerPoolTaskImpl : public internal::WorkerPoolTask {
  public:
   RasterWorkerPoolTaskImpl(PicturePileImpl* picture_pile,
                            const RasterWorkerPool::RasterCallback& task,
                            const base::Closure& reply)
       : internal::WorkerPoolTask(reply),
         picture_pile_(picture_pile),
         task_(task) {
     DCHECK(picture_pile_);
   }
 
-  virtual void Run() OVERRIDE {
-    task_.Run(picture_pile_.get(), &rendering_stats_);
+  virtual void Run(RenderingStats* rendering_stats) OVERRIDE {
+    task_.Run(picture_pile_.get(), rendering_stats);
   }
 
  private:
   scoped_refptr<PicturePileImpl> picture_pile_;
   RasterWorkerPool::RasterCallback task_;
 };
 
 }  // namespace
 
-RasterWorkerPool::RasterWorkerPool(size_t num_threads)
-    : WorkerPool(num_threads) {
+RasterWorkerPool::RasterWorkerPool(
+    size_t num_threads, bool record_rendering_stats)
+    : WorkerPool(num_threads, record_rendering_stats) {
 }
 
 RasterWorkerPool::~RasterWorkerPool() {
 }
 
 void RasterWorkerPool::PostRasterTaskAndReply(PicturePileImpl* picture_pile,
                                               const RasterCallback& task,
                                               const base::Closure& reply) {
   Worker* worker = GetWorkerForNextTask();
 
   scoped_refptr<PicturePileImpl> picture_pile_clone =
       picture_pile->GetCloneForDrawingOnThread(worker);
 
   worker->PostTask(
       make_scoped_ptr(new RasterWorkerPoolTaskImpl(
                           picture_pile_clone.get(),
                           task,
                           reply)).PassAs<internal::WorkerPoolTask>());
 }
 
 }  // namespace cc