cc: Merge TileTaskRunner to TileTaskWorkerPool.

cc/raster/one_copy_tile_task_worker_pool.cc

 // Copyright 2014 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/one_copy_tile_task_worker_pool.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <limits>
@@ skipping 92 matching lines @@
       bytes_scheduled_since_last_flush_(0),
       preferred_tile_format_(preferred_tile_format) {
   staging_pool_ = StagingBufferPool::Create(task_runner, resource_provider,
                                             use_partial_raster,
                                             max_staging_buffer_usage_in_bytes);
 }
 
 OneCopyTileTaskWorkerPool::~OneCopyTileTaskWorkerPool() {
 }
 
-TileTaskRunner* OneCopyTileTaskWorkerPool::AsTileTaskRunner() {
-  return this;
-}
-
 void OneCopyTileTaskWorkerPool::Shutdown() {
   TRACE_EVENT0("cc", "OneCopyTileTaskWorkerPool::Shutdown");
 
   TaskGraph empty;
   task_graph_runner_->ScheduleTasks(namespace_token_, &empty);
   task_graph_runner_->WaitForTasksToFinishRunning(namespace_token_);
 
   staging_pool_->Shutdown();
 }
 
@@ skipping 252 matching lines @@
     gl->OrderingBarrierCHROMIUM();
 
     // Generate sync token after the barrier for cross context synchronization.
     gpu::SyncToken sync_token;
     gl->GenUnverifiedSyncTokenCHROMIUM(fence_sync, sync_token.GetData());
     resource_lock->UpdateResourceSyncToken(sync_token);
   }
 }
 
 }  // namespace cc