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

chrome/browser/ui/cocoa/tabs/tab_strip_controller.h

Index: chrome/browser/ui/cocoa/tabs/tab_strip_controller.h
diff --git a/chrome/browser/ui/cocoa/tabs/tab_strip_controller.h b/chrome/browser/ui/cocoa/tabs/tab_strip_controller.h
index e2ef0086467175b9bdef9ac3867d29af98652997..6ecb25fe16d30a177b52566b228b91cffbab036a 100644
--- a/chrome/browser/ui/cocoa/tabs/tab_strip_controller.h
+++ b/chrome/browser/ui/cocoa/tabs/tab_strip_controller.h
@@ -13,6 +13,7 @@
 #import "chrome/browser/ui/cocoa/tabs/tab_controller_target.h"
 #import "chrome/browser/ui/cocoa/url_drop_target.h"
 #include "chrome/browser/ui/tabs/hover_tab_selector.h"
+#include "chrome/browser/ui/tabs/tab_utils.h"
 
 @class CrTrackingArea;
 @class CustomWindowControlsView;
@@ -267,6 +268,20 @@ class WebContents;
 // Removes custom traffic light buttons from the tab strip. Idempotent.
 - (void)removeCustomWindowControls;
 
+// Gets the tab and the media state to check whether the window
+// media state should be updated or not. If the tab media state is
+// AUDIO_PLAYING, the window media state should be set to AUDIO_PLAYING.
+// If the tab media state is AUDIO_MUTING, this method would check if the
+// window has no other tab with state AUDIO_PLAYING, then the window
+// media state will be set to AUDIO_MUTING. If the tab media state is NONE,
+// this method checks if the window has no playing or muting tab, then window
+// media state will be set as NONE.
+- (void)updateWindowMediaState:(TabMediaState)mediaState
+                            on:(content::WebContents*)changed;
+
+// Returns the media state associated with the contents.
+- (TabMediaState)mediaStateForContents:(content::WebContents*)contents;
+
 @end
 
 @interface TabStripController(TestingAPI)