Have browser process shutdown metro viewer on Metro -> Metro restart.

win8/metro_driver/chrome_app_view_ash.cc

 // Copyright (c) 2012 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 "win8/metro_driver/stdafx.h"
 #include "win8/metro_driver/chrome_app_view_ash.h"
 
 #include <corewindow.h>
 #include <shellapi.h>
 #include <windows.foundation.h>
@@ skipping 139 matching lines @@
 class ChromeChannelListener : public IPC::Listener {
  public:
   ChromeChannelListener(base::MessageLoop* ui_loop, ChromeAppViewAsh* app_view)
       : ui_proxy_(ui_loop->message_loop_proxy()),
         app_view_(app_view) {}
 
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE {
     IPC_BEGIN_MESSAGE_MAP(ChromeChannelListener, message)
       IPC_MESSAGE_HANDLER(MetroViewerHostMsg_ActivateDesktop,
                           OnActivateDesktop)
+      IPC_MESSAGE_HANDLER(MetroViewerHostMsg_MetroExit, OnMetroExit)
       IPC_MESSAGE_HANDLER(MetroViewerHostMsg_OpenURLOnDesktop,
                           OnOpenURLOnDesktop)
       IPC_MESSAGE_HANDLER(MetroViewerHostMsg_SetCursor, OnSetCursor)
       IPC_MESSAGE_HANDLER(MetroViewerHostMsg_DisplayFileOpen,
                           OnDisplayFileOpenDialog)
       IPC_MESSAGE_HANDLER(MetroViewerHostMsg_DisplayFileSaveAs,
                           OnDisplayFileSaveAsDialog)
       IPC_MESSAGE_HANDLER(MetroViewerHostMsg_DisplaySelectFolder,
                           OnDisplayFolderPicker)
       IPC_MESSAGE_HANDLER(MetroViewerHostMsg_SetCursorPos, OnSetCursorPos)
@@ skipping 17 matching lines @@
   }
 
  private:
   void OnActivateDesktop(const base::FilePath& shortcut, bool ash_exit) {
     ui_proxy_->PostTask(FROM_HERE,
         base::Bind(&ChromeAppViewAsh::OnActivateDesktop,
         base::Unretained(app_view_),
         shortcut, ash_exit));
   }
 
+  void OnMetroExit() {
+    MetroExit(app_view_->core_window_hwnd());
+  }
+
   void OnOpenURLOnDesktop(const base::FilePath& shortcut,
                           const base::string16& url) {
     ui_proxy_->PostTask(FROM_HERE,
         base::Bind(&ChromeAppViewAsh::OnOpenURLOnDesktop,
         base::Unretained(app_view_),
         shortcut, url));
   }
 
   void OnSetCursor(int64 cursor) {
     ui_proxy_->PostTask(FROM_HERE,
@@ skipping 1109 matching lines @@
   mswr::ComPtr<winapp::Core::ICoreApplicationExit> app_exit;
   CheckHR(core_app.As(&app_exit));
   globals.app_exit = app_exit.Detach();
 }
 
 IFACEMETHODIMP
 ChromeAppViewFactory::CreateView(winapp::Core::IFrameworkView** view) {
   *view = mswr::Make<ChromeAppViewAsh>().Detach();
   return (*view) ? S_OK :  E_OUTOFMEMORY;
 }