Add some simple HTMLViewer apptests.

mojo/services/html_viewer/html_document.h

Index: mojo/services/html_viewer/html_document.h
diff --git a/mojo/services/html_viewer/html_document.h b/mojo/services/html_viewer/html_document.h
index 217e2b8c266d4b90e0803b02efea17cf65ed0f9d..a1d3b2b8b41ecf42fca36e17a7519ee2533f5620 100644
--- a/mojo/services/html_viewer/html_document.h
+++ b/mojo/services/html_viewer/html_document.h
@@ -54,13 +54,12 @@ class HTMLDocument : public blink::WebViewClient,
  public:
   // Load a new HTMLDocument with |response|.
   //
-  // |services| should be used to implement a ServiceProvider which exposes
-  // services to the connecting application.
+  // Services are offered to the connecting application via |service_provider|.
   // Commonly, the connecting application is the ViewManager and it will
   // request ViewManagerClient.
   //
   // |shell| is the Shell connection for this mojo::Application.
-  HTMLDocument(mojo::InterfaceRequest<mojo::ServiceProvider> services,
+  HTMLDocument(mojo::ServiceProviderImpl* service_provider,
                mojo::URLResponsePtr response,
                mojo::Shell* shell,
                scoped_refptr<base::MessageLoopProxy> compositor_thread,
@@ -132,7 +131,6 @@ class HTMLDocument : public blink::WebViewClient,
   void Load(mojo::URLResponsePtr response);
 
   mojo::URLResponsePtr response_;
-  mojo::ServiceProviderImpl exported_services_;
   mojo::ServiceProviderPtr embedder_service_provider_;
   mojo::Shell* shell_;
   mojo::LazyInterfacePtr<mojo::NavigatorHost> navigator_host_;