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

chrome/browser/ui/cocoa/browser_window_cocoa.h

Index: chrome/browser/ui/cocoa/browser_window_cocoa.h
diff --git a/chrome/browser/ui/cocoa/browser_window_cocoa.h b/chrome/browser/ui/cocoa/browser_window_cocoa.h
index 637edc505c961ce0cdf4016a5cb27b8125130608..b2c1de094d68cd3154dc582403a27be5dcf63735 100644
--- a/chrome/browser/ui/cocoa/browser_window_cocoa.h
+++ b/chrome/browser/ui/cocoa/browser_window_cocoa.h
@@ -13,6 +13,7 @@
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/exclusive_access/exclusive_access_context.h"
 #include "chrome/browser/ui/search/search_model_observer.h"
+#include "chrome/browser/ui/tabs/tab_utils.h"
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "ui/base/ui_base_types.h"
 
@@ -177,9 +178,26 @@ class BrowserWindowCocoa
   // Adds the given FindBar cocoa controller to this browser window.
   void AddFindBar(FindBarCocoaController* find_bar_cocoa_controller);
 
+  // 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.
+  void UpdateMediaState(TabMediaState media_state);
+
   // Returns the cocoa-world BrowserWindowController
   BrowserWindowController* cocoa_controller() { return controller_; }
 
+  // Returns window title based on the active tab title and window media state.
+  NSString* WindowTitle();
+
+  // Returns current media state, determined by the media state of tabs, set by
+  // UpdateMediaState.
+  TabMediaState media_state() { return media_state_; }
+
+  // Returns playing emoji to be used in production and test code.
+  NSString* media_playing_emoji() { return @"🔊"; }
+
+  // Returns muting emoji to be used in production and test code.
+  NSString* media_muting_emoji() { return @"🔇"; }
+
  protected:
   void DestroyBrowser() override;
 
@@ -191,6 +209,11 @@ class BrowserWindowCocoa
   base::scoped_nsobject<NSString> pending_window_title_;
   ui::WindowShowState initial_show_state_;
   NSInteger attention_request_id_;  // identifier from requestUserAttention
+
+  // Preserves window media state to show appropriate icon in the window title
+  // which can be audio playing, muting or none (determined by media state of
+  // tabs.
+  TabMediaState media_state_;
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_COCOA_H_