[Cast, Android, Presentation API] Implement ReceiverAction messages.

chrome/android/java/src/org/chromium/chrome/browser/media/router/RouteDelegate.java

Index: chrome/android/java/src/org/chromium/chrome/browser/media/router/RouteDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/media/router/RouteDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/media/router/RouteDelegate.java
index 7056cbdfe5dd379cbffcc19eae0fd455c1f5eb44..bc7f8445ef52beabafe93ec4a4ae067517cc9e59 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/media/router/RouteDelegate.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/media/router/RouteDelegate.java
@@ -24,6 +24,11 @@ public interface RouteDelegate {
     void onRouteRequestError(String message, int requestId);
 
     /**
+     * Called when the user wants to stop the session via the UI (e.g. notification).
+     */
+    void onSessionStopAction();
+
+    /**
      * Called when the session is closed.
      */
     void onSessionClosed();