[Android] A prototype of the interactive media notification.

content/browser/android/web_contents_observer_proxy.h

Index: content/browser/android/web_contents_observer_proxy.h
diff --git a/content/browser/android/web_contents_observer_proxy.h b/content/browser/android/web_contents_observer_proxy.h
index f985041049991bfdd96564ce233298d7961af47e..bbce0942241a030dc05f9a0ea2b9c01602da8e14 100644
--- a/content/browser/android/web_contents_observer_proxy.h
+++ b/content/browser/android/web_contents_observer_proxy.h
@@ -71,6 +71,8 @@ class WebContentsObserverProxy : public WebContentsObserver {
   void DidStartNavigationToPendingEntry(
       const GURL& url,
       NavigationController::ReloadType reload_type) override;
+  void MediaSessionStateChanged(bool is_controllable,
+                                bool is_suspended) override;
 
   void DidFailLoadInternal(bool is_provisional_load,
                            bool is_main_frame,