Indicate in the Window menu which Chrome window has an active sound playing

chrome/browser/ui/browser_window.h

 // Copyright 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_WINDOW_H_
 #define CHROME_BROWSER_UI_BROWSER_WINDOW_H_
 
 #include "base/callback_forward.h"
 #include "chrome/browser/lifetime/browser_close_manager.h"
 #include "chrome/browser/signin/chrome_signin_helper.h"
 #include "chrome/browser/ssl/security_state_model.h"
 #include "chrome/browser/translate/chrome_translate_client.h"
 #include "chrome/browser/ui/bookmarks/bookmark_bar.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/exclusive_access/exclusive_access_bubble_type.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/browser/ui/sync/one_click_signin_sync_starter.h"
+#include "chrome/browser/ui/tabs/tab_utils.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 #include "components/signin/core/browser/signin_header_helper.h"
 #include "components/translate/core/common/translate_errors.h"
 #include "ui/base/base_window.h"
 #include "ui/base/window_open_disposition.h"
 #include "ui/gfx/native_widget_types.h"
 
 class Browser;
 class DownloadShelf;
 class ExclusiveAccessContext;
@@ skipping 58 matching lines @@
   //////////////////////////////////////////////////////////////////////////////
   // Browser specific methods:
 
   // Return the status bubble associated with the frame
   virtual StatusBubble* GetStatusBubble() = 0;
 
   // Inform the frame that the selected tab favicon or title has changed. Some
   // frames may need to refresh their title bar.
   virtual void UpdateTitleBar() = 0;
 
+#if defined(OS_MACOSX)
+  // Update window media state to show if one of the tabs within the window is
+  // playing an audio/video or even if it's playing something but it's muted.
+  virtual void UpdateMediaState(TabMediaState media_state) = 0;

[miu, 2015/10/21 20:06:52]

I'd ask an OWNER (e.g., sky@ or pkasting@) about this, but IMO I wouldn't
declare the virtual method in this header file.  Instead, just declare the
method in the BrowserWindowCocoa class (and then see my comment below).

+#endif
+
   // Invoked when the state of the bookmark bar changes. This is only invoked if
   // the state changes for the current tab, it is not sent when switching tabs.
   virtual void BookmarkBarStateChanged(
       BookmarkBar::AnimateChangeType change_type) = 0;
 
   // Inform the frame that the dev tools window for the selected tab has
   // changed.
   virtual void UpdateDevTools() = 0;
 
   // Update any loading animations running in the window. |should_animate| is
@@ skipping 285 matching lines @@
   // Returns object implementing ExclusiveAccessContext interface.
   virtual ExclusiveAccessContext* GetExclusiveAccessContext() = 0;
 
  protected:
   friend class BrowserCloseManager;
   friend class BrowserView;
   virtual void DestroyBrowser() = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_BROWSER_WINDOW_H_