Reland of cc: Add mailbox support to ResourceProvider write locks.

cc/test/fake_tile_task_manager.cc

 // Copyright 2016 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/test/fake_tile_task_manager.h"
 
 #include "base/memory/ptr_util.h"
 
 namespace cc {
 
-FakeTileTaskManagerImpl::FakeTileTaskManagerImpl()
-    : raster_buffer_provider_(base::WrapUnique<RasterBufferProvider>(
-          new FakeRasterBufferProviderImpl)) {}
-
-FakeTileTaskManagerImpl::FakeTileTaskManagerImpl(
-    std::unique_ptr<RasterBufferProvider> raster_buffer_provider)
-    : raster_buffer_provider_(std::move(raster_buffer_provider)) {}
+FakeTileTaskManagerImpl::FakeTileTaskManagerImpl() {}
 
 FakeTileTaskManagerImpl::~FakeTileTaskManagerImpl() {
   DCHECK_EQ(0u, completed_tasks_.size());
 }
 
 void FakeTileTaskManagerImpl::ScheduleTasks(TaskGraph* graph) {
   for (const auto& node : graph->nodes) {
     TileTask* task = static_cast<TileTask*>(node.task);
     // Cancel the task and append to |completed_tasks_|.
     task->state().DidCancel();
     completed_tasks_.push_back(task);
   }
 }
 
 void FakeTileTaskManagerImpl::CheckForCompletedTasks() {
   for (auto& task : completed_tasks_) {
     DCHECK(task->state().IsFinished() || task->state().IsCanceled());
     TileTask* tile_task = static_cast<TileTask*>(task.get());
     tile_task->OnTaskCompleted();
     tile_task->DidComplete();
   }
 
   completed_tasks_.clear();
 }
 
 void FakeTileTaskManagerImpl::Shutdown() {}
 
-RasterBufferProvider* FakeTileTaskManagerImpl::GetRasterBufferProvider() const {
-  return raster_buffer_provider_.get();
-}
-
 }  // namespace cc