Add a basic browser to mash that uses the navigation service.

services/navigation/navigation_unittest.cc

 // Copyright 2015 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 <memory>
 
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "services/navigation/public/interfaces/view.mojom.h"
 #include "services/shell/public/cpp/shell_client.h"
@@ skipping 23 matching lines @@
     loop_ = loop;
   }
 
  private:
   // mojom::ViewClient:
   void LoadingStateChanged(bool is_loading) override {
     // Should see loading start, then stop.
     if (++load_count_ == 2 && loop_)
       loop_->Quit();
   }
+  void NavigationStateChanged(const GURL& url,
+                              const mojo::String& title,
+                              bool can_go_back,
+                              bool can_go_forward) override {}
+  void LoadProgressChanged(double progress) override {}
+  void ViewCreated(mojom::ViewPtr, mojom::ViewClientRequest, bool,
+                   mojo::RectPtr, bool) override {}
+  void Close() override {}
 
   int load_count_ = 0;
   mojo::Binding<mojom::ViewClient> binding_;
   base::RunLoop* loop_ = nullptr;
   std::unique_ptr<shell::Connection> window_manager_connection_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationTest);
 };
 
-TEST_F(NavigationTest, LoadURL) {
+TEST_F(NavigationTest, Navigate) {
   mojom::ViewFactoryPtr view_factory;
   connector()->ConnectToInterface("exe:navigation", &view_factory);
 
   mojom::ViewPtr view;
   view_factory->CreateView(GetViewClient(), GetProxy(&view));
-  view->LoadUrl(GURL("about:blank"));
+  view->NavigateTo(GURL("about:blank"));
 
   base::RunLoop loop;
   QuitOnLoadingStateChange(&loop);
   loop.Run();
 }
 
 }  // namespace navigation