Add the DelegatingRenderer class with its initialize path.

cc/test/fake_layer_tree_host_client.cc

Index: cc/test/fake_layer_tree_host_client.cc
diff --git a/cc/test/fake_layer_tree_host_client.cc b/cc/test/fake_layer_tree_host_client.cc
index ff312f6a6d28ecbfab44372ff2f761652bfe0e02..a34f800b5c6067a3c45605bfd6d59498aecc57bd 100644
--- a/cc/test/fake_layer_tree_host_client.cc
+++ b/cc/test/fake_layer_tree_host_client.cc
@@ -9,10 +9,16 @@ namespace cc {
 scoped_ptr<OutputSurface> FakeLayerImplTreeHostClient::createOutputSurface()
 {
     if (m_useSoftwareRendering) {
+        if (m_useDelegatingRenderer)
+            return FakeOutputSurface::CreateDelegatingSoftware(make_scoped_ptr(new FakeSoftwareOutputDevice).PassAs<SoftwareOutputDevice>()).PassAs<OutputSurface>();
+
         return FakeOutputSurface::CreateSoftware(make_scoped_ptr(new FakeSoftwareOutputDevice).PassAs<SoftwareOutputDevice>()).PassAs<OutputSurface>();
     }
 
     WebKit::WebGraphicsContext3D::Attributes attrs;
+    if (m_useDelegatingRenderer)
+        return FakeOutputSurface::CreateDelegating3d(WebKit::CompositorFakeWebGraphicsContext3D::create(attrs).PassAs<WebKit::WebGraphicsContext3D>()).PassAs<OutputSurface>();
+
     return FakeOutputSurface::Create3d(WebKit::CompositorFakeWebGraphicsContext3D::create(attrs).PassAs<WebKit::WebGraphicsContext3D>()).PassAs<OutputSurface>();
 }