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

chrome/browser/ui/cocoa/browser_window_cocoa.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_COCOA_BROWSER_WINDOW_COCOA_H_
 #define CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_COCOA_H_
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/extensions/extension_keybinding_registry.h"
@@ skipping 40 matching lines @@
   void Close() override;
   void Activate() override;
   void Deactivate() override;
   bool IsActive() const override;
   void FlashFrame(bool flash) override;
   bool IsAlwaysOnTop() const override;
   void SetAlwaysOnTop(bool always_on_top) override;
   gfx::NativeWindow GetNativeWindow() const override;
   StatusBubble* GetStatusBubble() override;
   void UpdateTitleBar() override;
+  void UpdateMediaState(TabMediaState media_state,
+                        content::WebContents* contents) override;
   void BookmarkBarStateChanged(
       BookmarkBar::AnimateChangeType change_type) override;
   void UpdateDevTools() override;
   void UpdateLoadingAnimations(bool should_animate) override;
   void SetStarredState(bool is_starred) override;
   void SetTranslateIconToggled(bool is_lit) override;
   void OnActiveTabChanged(content::WebContents* old_contents,
                           content::WebContents* new_contents,
                           int index,
                           int reason) override;
@@ skipping 113 matching lines @@
   void DestroyBrowser() override;
 
  private:
   NSWindow* window() const;  // Accessor for the (current) |NSWindow|.
 
   Browser* browser_;  // weak, owned by controller
   BrowserWindowController* controller_;  // weak, owns us
   base::scoped_nsobject<NSString> pending_window_title_;
   ui::WindowShowState initial_show_state_;
   NSInteger attention_request_id_;  // identifier from requestUserAttention
+
+  TabMediaState media_state_;

[Robert Sesek, 2015/10/20 13:39:47]

Why do you need to track any additional data other than |media_state_| ?

+  TabMediaState prev_media_state_;
+  content::WebContents* media_state_contents_;
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_COCOA_H_