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..8913e4b048478137949e60f84d971cb6084e4f6e 100644
--- a/chrome/browser/ui/cocoa/browser_window_cocoa.mm
+++ b/chrome/browser/ui/cocoa/browser_window_cocoa.mm
@@ -88,6 +88,8 @@ const int kBookmarkAppBubbleViewHeight = 46;
 
 const int kIconPreviewTargetSize = 128;
 
+const char kWhiteSpaceCharacter = ' ';
+
 base::string16 TrimText(NSString* controlText) {
   base::string16 text = base::SysNSStringToUTF16(controlText);
   base::TrimWhitespace(text, base::TRIM_ALL, &text);
@@ -296,13 +298,36 @@ StatusBubble* BrowserWindowCocoa::GetStatusBubble() {
 }
 
 void BrowserWindowCocoa::UpdateTitleBar() {
-  NSString* newTitle =
-      base::SysUTF16ToNSString(browser_->GetWindowTitleForCurrentTab());
+  NSString* newTitle = GetWindowTitle();
+
+  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::GetWindowTitle() {
+  NSMutableString* newTitle = [NSMutableString
+      stringWithString:base::SysUTF16ToNSString(
+                           browser_->GetWindowTitleForCurrentTab())];
+
+  if (media_state_ == TAB_MEDIA_STATE_AUDIO_PLAYING)

[Robert Sesek, 2015/10/28 18:45:57]

nit: needs braces {} around both if and else if.

+    [newTitle
+        appendFormat:@"%c%@", kWhiteSpaceCharacter,

[Robert Sesek, 2015/10/28 18:45:57]

… continuing comment from the GRD file. Then this would be:

l10n_util::GetNSStringF(IDS_WINDOW_AUDIO_PLAYING_MAC,
browser_->GetWindowTitleForCurrentTab())

+                     l10n_util::GetNSString(IDS_WINDOW_AUDIO_PLAYING_MAC)];
+  else if (media_state_ == TAB_MEDIA_STATE_AUDIO_MUTING)
+    [newTitle appendFormat:@"%c%@", kWhiteSpaceCharacter,
+                           l10n_util::GetNSString(IDS_WINDOW_AUDIO_MUTE_MAC)];
+  return newTitle;
+}
 
-  pending_window_title_.reset(
-      [BrowserWindowUtils scheduleReplaceOldTitle:pending_window_title_.get()
-                                     withNewTitle:newTitle
-                                        forWindow:window()]);
+TabMediaState BrowserWindowCocoa::GetMediaState() {
+  return media_state_;
 }
 
 void BrowserWindowCocoa::BookmarkBarStateChanged(