cc: Change tile manager to have a raw ptr for the task runner.

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 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/trees/layer_tree_host_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 200 matching lines @@
       scroll_affects_scroll_handler_(false),
       scroll_layer_id_when_mouse_over_scrollbar_(Layer::INVALID_ID),
       tile_priorities_dirty_(false),
       settings_(settings),
       visible_(false),
       cached_managed_memory_policy_(settings.memory_policy_),
       is_synchronous_single_threaded_(!task_runner_provider->HasImplThread() &&
                                       !settings.single_thread_proxy_scheduler),
       // Must be initialized after is_synchronous_single_threaded_ and
       // task_runner_provider_.
-      // TODO(vmpstr): TileManager takes a scoped reftr for the task runner,
-      // figure out if it actually needs a ref or whether it can use a raw
-      // pointer.
       tile_manager_(new TileManager(this,
                                     GetTaskRunner(),
                                     is_synchronous_single_threaded_
                                         ? std::numeric_limits<size_t>::max()
                                         : settings.scheduled_raster_task_limit,
                                     settings.use_partial_raster)),
       pinch_gesture_active_(false),
       pinch_gesture_end_should_clear_scrolling_layer_(false),
       fps_counter_(
           FrameRateCounter::Create(task_runner_provider_->HasImplThread())),
@@ skipping 3815 matching lines @@
     const {
   return fixed_raster_scale_attempted_scale_change_history_.count() >=
          kFixedRasterScaleAttemptedScaleChangeThreshold;
 }
 
 void LayerTreeHostImpl::SetFixedRasterScaleAttemptedToChangeScale() {
   fixed_raster_scale_attempted_scale_change_history_.set(0);
 }
 
 }  // namespace cc