Add the DelegatingRenderer class with its initialize path.

cc/test/fake_output_surface.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/test/fake_output_surface.h"
 
 namespace cc {
 
 FakeOutputSurface::FakeOutputSurface(
-    scoped_ptr<WebKit::WebGraphicsContext3D> context3d) {
+    scoped_ptr<WebKit::WebGraphicsContext3D> context3d, bool has_parent) {
   context3d_ = context3d.Pass();
+  capabilities_.has_parent_compositor = has_parent;
 }
 
 FakeOutputSurface::FakeOutputSurface(
-    scoped_ptr<SoftwareOutputDevice> software_device) {
+    scoped_ptr<SoftwareOutputDevice> software_device, bool has_parent) {
   software_device_ = software_device.Pass();
+  capabilities_.has_parent_compositor = has_parent;
 }
 
 FakeOutputSurface::~FakeOutputSurface() {}
 
 bool FakeOutputSurface::BindToClient(OutputSurfaceClient* client) {
   if (!context3d_)
     return true;
   DCHECK(client);
   if (!context3d_->makeContextCurrent())
     return false;
@@ skipping 10 matching lines @@
   return context3d_.get();
 }
 
 SoftwareOutputDevice* FakeOutputSurface::SoftwareDevice() const {
   return software_device_.get();
 }
 
 void FakeOutputSurface::SendFrameToParentCompositor(const CompositorFrame&) {}
 
 }  // namespace cc