cc: Remove ScheduleOnOriginThread() and CompleteOnOriginThread().

cc/tiles/tile_task_manager.h

Index: cc/tiles/tile_task_manager.h
diff --git a/cc/tiles/tile_task_manager.h b/cc/tiles/tile_task_manager.h
index e670b415602ad33e4e75111e982e5d843fcd7447..478d2ad4b8aa85c978c8f7bac382a5886fe2e93f 100644
--- a/cc/tiles/tile_task_manager.h
+++ b/cc/tiles/tile_task_manager.h
@@ -13,9 +13,9 @@
 
 namespace cc {
 // This interface provides the wrapper over TaskGraphRunner for scheduling and
-// collecting tasks. The client can call CheckForCompletedTasks() at any time to
-// process all completed tasks at the moment that have finished running or
-// cancelled.
+// collecting tasks. The client can call CollectCompletedTasks() at any time
+// for processing all completed tasks at the moment that have finished running
+// or cancelled.
 class CC_EXPORT TileTaskManager {
  public:
   TileTaskManager();
@@ -28,11 +28,10 @@ class CC_EXPORT TileTaskManager {
   // ScheduleTasks().
   virtual void ScheduleTasks(TaskGraph* graph) = 0;
 
-  // Check for completed tasks and dispatch reply callbacks.
-  virtual void CheckForCompletedTasks() = 0;
+  // Collect completed tasks.
+  virtual void CollectCompletedTasks(Task::Vector* completed_tasks) = 0;
 
-  // Shutdown after canceling all previously scheduled tasks. Reply callbacks
-  // are still guaranteed to run when CheckForCompletedTasks() is called.
+  // Shutdown after canceling all previously scheduled tasks.
   virtual void Shutdown() = 0;
 
   // Get RasterBufferProvider.
@@ -49,7 +48,7 @@ class CC_EXPORT TileTaskManagerImpl : public TileTaskManager {
 
   // Overridden from TileTaskManager:
   void ScheduleTasks(TaskGraph* graph) override;
-  void CheckForCompletedTasks() override;
+  void CollectCompletedTasks(Task::Vector* completed_tasks) override;
   void Shutdown() override;
   RasterBufferProvider* GetRasterBufferProvider() const override;
 
@@ -61,7 +60,6 @@ class CC_EXPORT TileTaskManagerImpl : public TileTaskManager {
   std::unique_ptr<RasterBufferProvider> raster_buffer_provider_;
   TaskGraphRunner* task_graph_runner_;
   const NamespaceToken namespace_token_;
-  Task::Vector completed_tasks_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TileTaskManagerImpl);