cc: Refactor TileTaskWorkerPool.

cc/raster/one_copy_tile_task_worker_pool.cc

Index: cc/raster/one_copy_tile_task_worker_pool.cc
diff --git a/cc/raster/one_copy_tile_task_worker_pool.cc b/cc/raster/one_copy_tile_task_worker_pool.cc
index d8a3340a2187c7fc7d6aab80b764fd4be86eab91..5703c4d2e6626ee740804e1c788dfd9d4bef2f7b 100644
--- a/cc/raster/one_copy_tile_task_worker_pool.cc
+++ b/cc/raster/one_copy_tile_task_worker_pool.cc
@@ -70,7 +70,6 @@ const int kMaxBytesPerCopyOperation = 1024 * 1024 * 4;
 // static
 std::unique_ptr<TileTaskWorkerPool> OneCopyTileTaskWorkerPool::Create(
     base::SequencedTaskRunner* task_runner,
-    TaskGraphRunner* task_graph_runner,
     ContextProvider* context_provider,
     ResourceProvider* resource_provider,
     int max_copy_texture_chromium_size,
@@ -78,22 +77,19 @@ std::unique_ptr<TileTaskWorkerPool> OneCopyTileTaskWorkerPool::Create(
     int max_staging_buffer_usage_in_bytes,
     ResourceFormat preferred_tile_format) {
   return base::WrapUnique<TileTaskWorkerPool>(new OneCopyTileTaskWorkerPool(
-      task_runner, task_graph_runner, resource_provider,
-      max_copy_texture_chromium_size, use_partial_raster,
-      max_staging_buffer_usage_in_bytes, preferred_tile_format));
+      task_runner, resource_provider, max_copy_texture_chromium_size,
+      use_partial_raster, max_staging_buffer_usage_in_bytes,
+      preferred_tile_format));
 }
 
 OneCopyTileTaskWorkerPool::OneCopyTileTaskWorkerPool(
     base::SequencedTaskRunner* task_runner,
-    TaskGraphRunner* task_graph_runner,
     ResourceProvider* resource_provider,
     int max_copy_texture_chromium_size,
     bool use_partial_raster,
     int max_staging_buffer_usage_in_bytes,
     ResourceFormat preferred_tile_format)
-    : task_graph_runner_(task_graph_runner),
-      namespace_token_(task_graph_runner->GetNamespaceToken()),
-      resource_provider_(resource_provider),
+    : resource_provider_(resource_provider),
       max_bytes_per_copy_operation_(
           max_copy_texture_chromium_size
               ? std::min(kMaxBytesPerCopyOperation,
@@ -110,45 +106,13 @@ OneCopyTileTaskWorkerPool::OneCopyTileTaskWorkerPool(
 OneCopyTileTaskWorkerPool::~OneCopyTileTaskWorkerPool() {
 }
 
-void OneCopyTileTaskWorkerPool::Shutdown() {
-  TRACE_EVENT0("cc", "OneCopyTileTaskWorkerPool::Shutdown");
+void OneCopyTileTaskWorkerPool::BarrierToSyncResources() {
+  TRACE_EVENT0("cc", "OneCopyTileTaskWorkerPool::BarrierToSyncResources");
 
-  TaskGraph empty;
-  task_graph_runner_->ScheduleTasks(namespace_token_, &empty);
-  task_graph_runner_->WaitForTasksToFinishRunning(namespace_token_);
-
-  staging_pool_->Shutdown();
-}
-
-void OneCopyTileTaskWorkerPool::ScheduleTasks(TaskGraph* graph) {
-  TRACE_EVENT0("cc", "OneCopyTileTaskWorkerPool::ScheduleTasks");
-
-  ScheduleTasksOnOriginThread(this, graph);
-
-  // Barrier to sync any new resources to the worker context.
   resource_provider_->output_surface()
       ->context_provider()
       ->ContextGL()
       ->OrderingBarrierCHROMIUM();
-
-  task_graph_runner_->ScheduleTasks(namespace_token_, graph);
-}
-
-void OneCopyTileTaskWorkerPool::CheckForCompletedTasks() {
-  TRACE_EVENT0("cc", "OneCopyTileTaskWorkerPool::CheckForCompletedTasks");
-
-  task_graph_runner_->CollectCompletedTasks(namespace_token_,
-                                            &completed_tasks_);
-
-  for (Task::Vector::const_iterator it = completed_tasks_.begin();
-       it != completed_tasks_.end(); ++it) {
-    TileTask* task = static_cast<TileTask*>(it->get());
-
-    task->WillComplete();
-    task->CompleteOnOriginThread(this);
-    task->DidComplete();
-  }
-  completed_tasks_.clear();
 }
 
 ResourceFormat OneCopyTileTaskWorkerPool::GetResourceFormat(