cc: Move GPU raster to DirectRasterWorkerPool.

cc/resources/image_raster_worker_pool.h

Index: cc/resources/image_raster_worker_pool.h
diff --git a/cc/resources/image_raster_worker_pool.h b/cc/resources/image_raster_worker_pool.h
index b3b8ad80363a1958fa32b8acb2e79cd3582aaed3..8bd3c517245bab1761ca58a8986c6fab43ad7ec1 100644
--- a/cc/resources/image_raster_worker_pool.h
+++ b/cc/resources/image_raster_worker_pool.h
@@ -15,7 +15,6 @@ class CC_EXPORT ImageRasterWorkerPool : public RasterWorkerPool {
 
   static scoped_ptr<RasterWorkerPool> Create(
       ResourceProvider* resource_provider,
-      ContextProvider* context_provider,
       unsigned texture_target);
 
   // Overridden from RasterWorkerPool:
@@ -30,12 +29,12 @@ class CC_EXPORT ImageRasterWorkerPool : public RasterWorkerPool {
   virtual void OnRasterCompleted(internal::RasterWorkerPoolTask* task,
                                  const PicturePileImpl::Analysis& analysis)
       OVERRIDE;
-  virtual void OnImageDecodeCompleted(internal::WorkerPoolTask* task) OVERRIDE;
+  virtual void OnImageDecodeCompleted(internal::WorkerPoolTask* task) OVERRIDE {
+  }
 
  protected:
   ImageRasterWorkerPool(internal::TaskGraphRunner* task_graph_runner,
                         ResourceProvider* resource_provider,
-                        ContextProvider* context_provider,
                         unsigned texture_target);
 
  private: