cc: Implement states for Task for stricter control.

cc/tiles/tile_manager.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/tiles/tile_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 86 matching lines @@
   }
 
   // Overridden from TileTask:
   void ScheduleOnOriginThread(RasterBufferProvider* provider) override {
     DCHECK(!raster_buffer_);
     raster_buffer_ = provider->AcquireBufferForRaster(
         resource_, resource_content_id_, previous_content_id_);
   }
   void CompleteOnOriginThread(RasterBufferProvider* provider) override {
     provider->ReleaseBufferForRaster(std::move(raster_buffer_));
-    reply_.Run(!HasFinishedRunning());
+    reply_.Run(!state().IsFinished());
   }
 
  protected:
   ~RasterTaskImpl() override { DCHECK(!raster_buffer_); }
 
  private:
   const Resource* resource_;
   scoped_refptr<RasterSource> raster_source_;
   gfx::Rect content_rect_;
   gfx::Rect invalid_content_rect_;
@@ skipping 1120 matching lines @@
 void TileManager::Signals::reset() {
   ready_to_activate = false;
   did_notify_ready_to_activate = false;
   ready_to_draw = false;
   did_notify_ready_to_draw = false;
   all_tile_tasks_completed = false;
   did_notify_all_tile_tasks_completed = false;
 }
 
 }  // namespace cc