cros: Bind hangup red button on remote controller to close web dialog

chrome/browser/ui/browser_dialogs.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_BROWSER_DIALOGS_H_
 #define CHROME_BROWSER_UI_BROWSER_DIALOGS_H_
 
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 76 matching lines @@
 // Make sure to use the returned window only when you know it is safe
 // to do so, i.e. before OnDialogClosed() is called on the delegate.
 gfx::NativeWindow ShowWebDialog(gfx::NativeView parent,
                                 content::BrowserContext* context,
                                 ui::WebDialogDelegate* delegate);
 #endif  // !defined(OS_MACOSX)
 
 #if defined(USE_ASH)
 // Creates and shows an HTML dialog with the given delegate and browser context.
 // The dialog is placed in the ash window hierarchy in the given container.
+// Returns the created window.

[sky, 2017/05/11 15:04:11]

Document the lifetime of the returned window and who owns it.

[Qiang(Joe) Xu, 2017/05/12 21:50:45]

Add the same comment as above: The window is automatically destroyed when it is
closed.

 // See ash/public/cpp/shell_window_ids.h for |container_id| values. The window
 // is destroyed when it is closed. See also chrome::ShowWebDialog().
-void ShowWebDialogInContainer(int container_id,
-                              content::BrowserContext* context,
-                              ui::WebDialogDelegate* delegate);
+gfx::NativeWindow ShowWebDialogInContainer(int container_id,
+                                           content::BrowserContext* context,
+                                           ui::WebDialogDelegate* delegate);
 #endif  // defined(USE_ASH)
 
 // Shows the create chrome app shortcut dialog box.
 // |close_callback| may be null.
 void ShowCreateChromeAppShortcutsDialog(
     gfx::NativeWindow parent_window,
     Profile* profile,
     const extensions::Extension* app,
     const base::Callback<void(bool /* created */)>& close_callback);
 
@@ skipping 165 matching lines @@
 using BubbleShowPtr =
     void (*)(content::WebContents*,
              const std::vector<arc::ArcNavigationThrottle::AppInfo>&,
              const IntentPickerResponse&);
 
 BubbleShowPtr ShowIntentPickerBubble();
 
 #endif  // OS_CHROMEOS
 
 #endif  // CHROME_BROWSER_UI_BROWSER_DIALOGS_H_