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

chrome/browser/ui/cocoa/browser_window_cocoa.mm

Index: chrome/browser/ui/cocoa/browser_window_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_cocoa.mm b/chrome/browser/ui/cocoa/browser_window_cocoa.mm
index 028c744d53dd56751ccc7c2e29262a534a056ffc..85239eb077dcc304cba4225feb80de256402c7bc 100644
--- a/chrome/browser/ui/cocoa/browser_window_cocoa.mm
+++ b/chrome/browser/ui/cocoa/browser_window_cocoa.mm
@@ -296,13 +296,32 @@ StatusBubble* BrowserWindowCocoa::GetStatusBubble() {
 }
 
 void BrowserWindowCocoa::UpdateTitleBar() {
-  NSString* newTitle =
-      base::SysUTF16ToNSString(browser_->GetWindowTitleForCurrentTab());
+  NSString* newTitle = windowTitle();
 
-  pending_window_title_.reset(
-      [BrowserWindowUtils scheduleReplaceOldTitle:pending_window_title_.get()
-                                     withNewTitle:newTitle
-                                        forWindow:window()]);
+  pending_window_title_.reset([BrowserWindowUtils
+      scheduleReplaceOldTitle:pending_window_title_.get()
+                 withNewTitle:newTitle
+                    forWindow:window()]);
+}
+
+void BrowserWindowCocoa::UpdateMediaState(TabMediaState media_state) {
+  media_state_ = media_state;
+  UpdateTitleBar();
+}
+
+NSString* BrowserWindowCocoa::windowTitle() {
+  if (media_state_ == TAB_MEDIA_STATE_AUDIO_PLAYING) {
+    return l10n_util::GetNSStringF(IDS_WINDOW_AUDIO_PLAYING_MAC,
+                                   browser_->GetWindowTitleForCurrentTab());
+  } else if (media_state_ == TAB_MEDIA_STATE_AUDIO_MUTING) {
+    return l10n_util::GetNSStringF(IDS_WINDOW_AUDIO_MUTING_MAC,
+                                   browser_->GetWindowTitleForCurrentTab());
+  }
+  return base::SysUTF16ToNSString(browser_->GetWindowTitleForCurrentTab());
+}
+
+TabMediaState BrowserWindowCocoa::mediaState() {
+  return media_state_;
 }
 
 void BrowserWindowCocoa::BookmarkBarStateChanged(