cc: Remove ScheduleOnOriginThread() and CompleteOnOriginThread().

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 79429ad36a2cf8001302f2cb032e4e4a73ad24f9..d33be114786abdd7ff77b47926c4af6f8f131bf5 100644
--- a/cc/raster/one_copy_tile_task_worker_pool.cc
+++ b/cc/raster/one_copy_tile_task_worker_pool.cc
@@ -256,8 +256,6 @@ void OneCopyTileTaskWorkerPool::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()
@@ -267,21 +265,11 @@ void OneCopyTileTaskWorkerPool::ScheduleTasks(TaskGraph* graph) {
   task_graph_runner_->ScheduleTasks(namespace_token_, graph);
 }
 
-void OneCopyTileTaskWorkerPool::CheckForCompletedTasks() {
+void OneCopyTileTaskWorkerPool::CollectCompletedTasks(
+    Task::Vector* completed_tasks) {
   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();
+  task_graph_runner_->CollectCompletedTasks(namespace_token_, completed_tasks);
 }
 
 ResourceFormat OneCopyTileTaskWorkerPool::GetResourceFormat(
@@ -300,6 +288,10 @@ bool OneCopyTileTaskWorkerPool::GetResourceRequiresSwizzle(
   return ResourceFormatRequiresSwizzle(GetResourceFormat(must_support_alpha));
 }
 
+TileTaskClient* OneCopyTileTaskWorkerPool::AsTileTaskClient() {
+  return this;
+}
+
 scoped_ptr<RasterBuffer> OneCopyTileTaskWorkerPool::AcquireBufferForRaster(
     const Resource* resource,
     uint64_t resource_content_id,