Add navigation client lib for convenience

services/navigation/public/cpp/view.h

Index: services/navigation/public/cpp/view.h
diff --git a/services/navigation/public/cpp/view.h b/services/navigation/public/cpp/view.h
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+// Copyright 2016 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.
+
+#ifndef SERVICES_NAVIGATION_PUBLIC_CPP_VIEW_H_
+#define SERVICES_NAVIGATION_PUBLIC_CPP_VIEW_H_
+
+#include <string>
+
+#include "mojo/public/cpp/bindings/binding.h"
+#include "services/navigation/public/interfaces/view.mojom.h"
+#include "ui/gfx/geometry/rect.h"
+#include "url/gurl.h"
+
+namespace navigation {
+
+class ViewDelegate;
+
+class View : public mojom::ViewClient {
+ public:
+  explicit View(ViewDelegate* delegate);
+  View(const View&) = delete;
+  ~View();
+  void operator=(const View&) = delete;
+
+  void Init(mojom::ViewFactoryPtr view_factory);
+
+  void NavigateTo(const GURL& url);
+  void GoBack();
+  void GoForward();
+  void Reload(bool skip_cache);
+  void Stop();
+  void ShowInterstitial(const std::string& html);
+  void HideInterstitial();
+  void SetResizerSize(const gfx::Size& size);
+
+ private:
+  // mojom::ViewClient:
+  void LoadingStateChanged(bool is_loading) override;
+  void NavigationStateChanged(const GURL& url,
+                              const mojo::String& title,
+                              bool can_go_back,
+                              bool can_go_forward) override;
+  void LoadProgressChanged(double progress) override;
+  void UpdateHoverURL(const GURL& url) override;
+  void ViewCreated(mojom::ViewPtr view,
+                   mojom::ViewClientRequest client,
+                   bool is_popup,
+                   const gfx::Rect& initial_rect,
+                   bool user_gesture) override;
+  void Close();
+
+  bool is_loading_ = false;
+  bool can_go_back_ = false;
+  bool can_go_forward_ = false;
+  double load_progress_ = 0.f;
+  std::string title_;
+  GURL hover_url_;
+
+  ViewDelegate* delegate_;
+
+  mojom::ViewPtr view_;
+  mojo::Binding<mojom::ViewClient> binding_;
+};
+
+}  // namespace navigation
+
+#endif  // SERVICES_NAVIGATION_PUBLIC_CPP_VIEW_H_