cc: Send notification of tasks completion directly without scheduling.

cc/tiles/tile_manager.h

Index: cc/tiles/tile_manager.h
diff --git a/cc/tiles/tile_manager.h b/cc/tiles/tile_manager.h
index 7c45c8f1786e4cce9f43bad2717b2e25e3ddc209..3ae70cf1cae17d3a7480d32fba734d1dde30031d 100644
--- a/cc/tiles/tile_manager.h
+++ b/cc/tiles/tile_manager.h
@@ -268,7 +268,9 @@ class CC_EXPORT TileManager {
   bool TilePriorityViolatesMemoryPolicy(const TilePriority& priority);
   bool AreRequiredTilesReadyToDraw(RasterTilePriorityQueue::Type type) const;
   void CheckIfMoreTilesNeedToBePrepared();
-  void CheckAndIssueSignals();
+  void CheckAndNotifyReadyToActivate();
+  void CheckAndNotifyReadyToDraw();
+  void CheckAndNotifyAllTileTasksCompleted();
   bool MarkTilesOutOfMemory(
       std::unique_ptr<RasterTilePriorityQueue> queue) const;
 
@@ -316,23 +318,6 @@ class CC_EXPORT TileManager {
   scoped_refptr<TileTask> required_for_draw_done_task_;
   scoped_refptr<TileTask> all_done_task_;
 
-  UniqueNotifier more_tiles_need_prepare_check_notifier_;
-
-  struct Signals {
-    Signals();
-
-    void reset();
-
-    bool ready_to_activate;
-    bool did_notify_ready_to_activate;
-    bool ready_to_draw;
-    bool did_notify_ready_to_draw;
-    bool all_tile_tasks_completed;
-    bool did_notify_all_tile_tasks_completed;
-  } signals_;
-
-  UniqueNotifier signals_check_notifier_;
-
   bool has_scheduled_tile_tasks_;
 
   uint64_t prepare_tiles_count_;