Revert of cc: Remove WorkerPool class and instead use TaskGraphRunner directly.

cc/resources/pixel_buffer_raster_worker_pool.cc

 // Copyright 2013 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/resources/pixel_buffer_raster_worker_pool.h"
 
 #include "base/containers/stack_container.h"
 #include "base/debug/trace_event.h"
 #include "base/values.h"
 #include "cc/debug/traced_value.h"
@@ skipping 14 matching lines @@
 
   PixelBufferWorkerPoolTaskImpl(internal::RasterWorkerPoolTask* task,
                                 uint8_t* buffer,
                                 const Reply& reply)
       : task_(task),
         buffer_(buffer),
         reply_(reply),
         needs_upload_(false) {
   }
 
-  // Overridden from internal::Task:
+  // Overridden from internal::WorkerPoolTask:
   virtual void RunOnWorkerThread(unsigned thread_index) OVERRIDE {
     // |buffer_| can be NULL in lost context situations.
     if (!buffer_) {
       // |needs_upload_| still needs to be true as task has not
       // been canceled.
       needs_upload_ = true;
       return;
     }
     needs_upload_ = task_->RunOnWorkerThread(thread_index,
                                              buffer_,
                                              task_->resource()->size(),
                                              0);
   }
-
-  // Overridden from internal::WorkerPoolTask:
   virtual void CompleteOnOriginThread() OVERRIDE {
     // |needs_upload_| must be be false if task didn't run.
     DCHECK(HasFinishedRunning() || !needs_upload_);
     reply_.Run(!HasFinishedRunning(), needs_upload_);
   }
 
  private:
   virtual ~PixelBufferWorkerPoolTaskImpl() {}
 
   scoped_refptr<internal::RasterWorkerPoolTask> task_;
@@ skipping 52 matching lines @@
   DCHECK(shutdown_);
   DCHECK(!check_for_completed_raster_tasks_pending_);
   DCHECK_EQ(0u, pixel_buffer_tasks_.size());
   DCHECK_EQ(0u, tasks_with_pending_upload_.size());
   DCHECK_EQ(0u, completed_tasks_.size());
 }
 
 void PixelBufferRasterWorkerPool::Shutdown() {
   shutdown_ = true;
   RasterWorkerPool::Shutdown();
-
-  CheckForCompletedWorkerPoolTasks();
+  CheckForCompletedWorkerTasks();
   CheckForCompletedUploads();
   check_for_completed_raster_tasks_callback_.Cancel();
   check_for_completed_raster_tasks_pending_ = false;
   for (TaskMap::iterator it = pixel_buffer_tasks_.begin();
        it != pixel_buffer_tasks_.end(); ++it) {
     internal::RasterWorkerPoolTask* task = it->first;
     internal::WorkerPoolTask* pixel_buffer_task = it->second.get();
 
     // All inactive tasks needs to be canceled.
     if (!pixel_buffer_task && !task->HasFinishedRunning()) {
@@ skipping 68 matching lines @@
        it != completed_tasks_.end() && !tasks_required_for_activation_.empty();
        ++it) {
     tasks_required_for_activation_.erase(*it);
   }
 
   pixel_buffer_tasks_.swap(new_pixel_buffer_tasks);
 
   // Check for completed tasks when ScheduleTasks() is called as
   // priorities might have changed and this maximizes the number
   // of top priority tasks that are scheduled.
-  CheckForCompletedWorkerPoolTasks();
+  CheckForCompletedWorkerTasks();
   CheckForCompletedUploads();
   FlushUploads();
 
   // Schedule new tasks.
   ScheduleMoreTasks();
 
   // Cancel any pending check for completed raster tasks and schedule
   // another check.
   check_for_completed_raster_tasks_callback_.Cancel();
   check_for_completed_raster_tasks_pending_ = false;
   ScheduleCheckForCompletedRasterTasks();
 
   RunGpuRasterTasks(gpu_raster_tasks);
 
   TRACE_EVENT_ASYNC_STEP_INTO1(
       "cc", "ScheduledTasks", this, StateName(),
       "state", TracedValue::FromValue(StateAsValue().release()));
 }
 
-unsigned PixelBufferRasterWorkerPool::GetResourceTarget() const {
+GLenum PixelBufferRasterWorkerPool::GetResourceTarget() const {
   return GL_TEXTURE_2D;
 }
 
 ResourceFormat PixelBufferRasterWorkerPool::GetResourceFormat() const {
   return resource_provider()->memory_efficient_texture_format();
 }
 
 void PixelBufferRasterWorkerPool::CheckForCompletedTasks() {
   TRACE_EVENT0("cc", "PixelBufferRasterWorkerPool::CheckForCompletedTasks");
 
@@ skipping 143 matching lines @@
 
 void PixelBufferRasterWorkerPool::CheckForCompletedRasterTasks() {
   TRACE_EVENT0(
       "cc", "PixelBufferRasterWorkerPool::CheckForCompletedRasterTasks");
 
   DCHECK(should_notify_client_if_no_tasks_are_pending_);
 
   check_for_completed_raster_tasks_callback_.Cancel();
   check_for_completed_raster_tasks_pending_ = false;
 
-  CheckForCompletedWorkerPoolTasks();
+  CheckForCompletedWorkerTasks();
   CheckForCompletedUploads();
   FlushUploads();
 
   // Determine what client notifications to generate.
   bool will_notify_client_that_no_tasks_required_for_activation_are_pending =
       (should_notify_client_if_no_tasks_required_for_activation_are_pending_ &&
        !raster_required_for_activation_finished_task_pending_ &&
        !HasPendingTasksRequiredForActivation());
   bool will_notify_client_that_no_tasks_are_pending =
       (should_notify_client_if_no_tasks_are_pending_ &&
@@ skipping 286 matching lines @@
 
   throttle_state->SetInteger("bytes_available_for_upload",
                              max_bytes_pending_upload_ - bytes_pending_upload_);
   throttle_state->SetInteger("bytes_pending_upload", bytes_pending_upload_);
   throttle_state->SetInteger("scheduled_raster_task_count",
                              scheduled_raster_task_count_);
   return throttle_state.PassAs<base::Value>();
 }
 
 }  // namespace cc