Re-land: cc: Add raster finished signals to RasterWorkerPool.

cc/resources/raster_worker_pool_unittest.cc

 // Copyright 2013 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/resources/raster_worker_pool.h"
 
 #include <vector>
 
 #include "cc/resources/image_raster_worker_pool.h"
 #include "cc/resources/picture_pile.h"
@@ skipping 60 matching lines @@
       return;
     raster_worker_pool_->Shutdown();
     raster_worker_pool_->CheckForCompletedTasks();
   }
 
   // Overriden from RasterWorkerPoolClient:
   virtual bool ShouldForceTasksRequiredForActivationToComplete() const
       OVERRIDE {
     return false;
   }
+  virtual void DidFinishedRunningTasks() OVERRIDE { }
+  virtual void DidFinishedRunningTasksRequiredForActivation() OVERRIDE {}
 
   virtual void BeginTest() = 0;
   virtual void AfterTest() = 0;
 
   ResourceProvider* resource_provider() const {
     return resource_provider_.get();
   }
 
   RasterWorkerPool* worker_pool() {
     return raster_worker_pool_.get();
@@ skipping 177 matching lines @@
     ASSERT_EQ(1u, tasks_.size());
     tasks_.clear();
   }
 };
 
 PIXEL_BUFFER_AND_IMAGE_TEST_F(RasterWorkerPoolTestFailedMapResource);
 
 }  // namespace
 
 }  // namespace cc