Send Navigation notifications to clients.

services/navigation/view_impl.h

 // 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_VIEW_IMPL_H_
 #define SERVICES_NAVIGATION_VIEW_IMPL_H_
 
 #include "base/macros.h"
 #include "components/mus/public/cpp/window_tree_client_delegate.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "services/navigation/public/interfaces/view.mojom.h"
 #include "services/shell/public/cpp/interface_factory.h"
 #include "services/shell/public/cpp/shell_client.h"
 #include "services/shell/public/cpp/shell_connection_ref.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/views/widget/widget_delegate.h"
 
 namespace views {
 class WebView;
 class Widget;
 }
 
 namespace navigation {
 
 class ViewImpl : public mojom::View,
                  public content::WebContentsDelegate,
+                 public content::NotificationObserver,
                  public mus::WindowTreeClientDelegate,
                  public views::WidgetDelegate {
  public:
   ViewImpl(shell::Connector* connector,
            content::BrowserContext* browser_context,
            mojom::ViewClientPtr client,
            mojom::ViewRequest request,
            std::unique_ptr<shell::ShellConnectionRef> ref);
   ~ViewImpl() override;
 
  private:
   // mojom::View:
   void NavigateTo(const GURL& url) override;
   void GoBack() override;
   void GoForward() override;
+  void NavigateToOffset(int offset) override;
   void Reload(bool skip_cache) override;
   void Stop() override;
   void GetWindowTreeClient(
       mus::mojom::WindowTreeClientRequest request) override;
   void ShowInterstitial(const mojo::String& html) override;
   void HideInterstitial() override;
   void SetResizerSize(const gfx::Size& size) override;
 
   // content::WebContentsDelegate:
   void AddNewContents(content::WebContents* source,
                       content::WebContents* new_contents,
                       WindowOpenDisposition disposition,
                       const gfx::Rect& initial_rect,
                       bool user_gesture,
                       bool* was_blocked) override;
   void CloseContents(content::WebContents* source) override;
   void LoadingStateChanged(content::WebContents* source,
                            bool to_different_document) override;
   void NavigationStateChanged(content::WebContents* source,
                               content::InvalidateTypes changed_flags) override;
   void LoadProgressChanged(content::WebContents* source,
                            double progress) override;
   void UpdateTargetURL(content::WebContents* source, const GURL& url) override;
   gfx::Rect GetRootWindowResizerRect() const override;
 
+  // content::NotificationObserver:
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
+
   // mus::WindowTreeClientDelegate:
   void OnEmbed(mus::Window* root) override;
   void OnWindowTreeClientDestroyed(mus::WindowTreeClient* client) override;
   void OnEventObserved(const ui::Event& event, mus::Window* target) override;
 
   // views::WidgetDelegate:
   views::View* GetContentsView() override;
   views::Widget* GetWidget() override;
   const views::Widget* GetWidget() const override;
 
   shell::Connector* connector_;
   mojo::StrongBinding<mojom::View> binding_;
   mojom::ViewClientPtr client_;
   std::unique_ptr<shell::ShellConnectionRef> ref_;
 
   views::WebView* web_view_;
 
   std::unique_ptr<content::WebContents> web_contents_;
 
+  content::NotificationRegistrar registrar_;
+
   std::unique_ptr<views::Widget> widget_;
 
   gfx::Size resizer_size_;
 
   DISALLOW_COPY_AND_ASSIGN(ViewImpl);
 };
 
 }  // navigation
 
 #endif  // SERVICES_NAVIGATION_VIEW_IMPL_H_