Teach the native viewport service to draw a Surface into itself

mojo/shell/context.cc

Index: mojo/shell/context.cc
diff --git a/mojo/shell/context.cc b/mojo/shell/context.cc
index 706c511489a72a1f4564f3c3f22e7cc3536ee1c5..6ab04b328f7ef8527434d9bccba9a8d170b1f785 100644
--- a/mojo/shell/context.cc
+++ b/mojo/shell/context.cc
@@ -141,7 +141,7 @@ class Context::NativeViewportApplicationLoader
   // InterfaceFactory<NativeViewport> implementation.
   virtual void Create(ApplicationConnection* connection,
                       InterfaceRequest<NativeViewport> request) OVERRIDE {
-    BindToRequest(new NativeViewportImpl, &request);
+    BindToRequest(new NativeViewportImpl(app_.get()), &request);
   }
 
   // InterfaceFactory<Gpu> implementation.