cc: Remove ScheduleOnOriginThread() and CompleteOnOriginThread().

cc/tiles/tile_manager_perftest.cc

Index: cc/tiles/tile_manager_perftest.cc
diff --git a/cc/tiles/tile_manager_perftest.cc b/cc/tiles/tile_manager_perftest.cc
index d4ef597b1a229f476a648ee1b790b9b1374d1998..06befcd9276fdd553f802ddff237580fd2a04028 100644
--- a/cc/tiles/tile_manager_perftest.cc
+++ b/cc/tiles/tile_manager_perftest.cc
@@ -44,21 +44,13 @@ class FakeTileTaskRunnerImpl : public TileTaskRunner, public TileTaskClient {
   void ScheduleTasks(TaskGraph* graph) override {
     for (auto& node : graph->nodes) {
       TileTask* task = static_cast<TileTask*>(node.task);
-
-      task->WillSchedule();
-      task->ScheduleOnOriginThread(this);
-      task->DidSchedule();
-
       completed_tasks_.push_back(task);
     }
   }
-  void CheckForCompletedTasks() override {
+  void CollectCompletedTasks(Task::Vector* completed_tasks) override {
     for (TileTask::Vector::iterator it = completed_tasks_.begin();
          it != completed_tasks_.end(); ++it) {
       TileTask* task = it->get();
-
-      task->WillComplete();
-      task->CompleteOnOriginThread(this);
       task->DidComplete();
     }
     completed_tasks_.clear();
@@ -69,6 +61,7 @@ class FakeTileTaskRunnerImpl : public TileTaskRunner, public TileTaskClient {
   bool GetResourceRequiresSwizzle(bool must_support_alpha) const override {
     return ResourceFormatRequiresSwizzle(GetResourceFormat(must_support_alpha));
   }
+  TileTaskClient* AsTileTaskClient() override { return this; }
 
   // Overridden from TileTaskClient:
   std::unique_ptr<RasterBuffer> AcquireBufferForRaster(