cc: Support on demand raster with ganesh

cc/test/fake_renderer_client.cc

 // Copyright 2014 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/test/fake_renderer_client.h"
 
 namespace cc {
 
 FakeRendererClient::FakeRendererClient()
     : set_full_root_layer_damage_count_(0) {
 }
 
 void FakeRendererClient::SetFullRootLayerDamage() {
   ++set_full_root_layer_damage_count_;
 }
 
+bool FakeRendererClient::UseTaskGraphRunnerForOnDemandRaster() {
+  return true;
+}
+
 }  // namespace cc