Deliver action clicks to page notifications (blink)

public/platform/modules/notifications/WebNotificationDelegate.h

Index: public/platform/modules/notifications/WebNotificationDelegate.h
diff --git a/public/platform/modules/notifications/WebNotificationDelegate.h b/public/platform/modules/notifications/WebNotificationDelegate.h
index 5c77233e2320a4fbea7d8a069d44734d8900ceed..a7afdb5a44a0cde723e4a5bb57f16ef93d516c55 100644
--- a/public/platform/modules/notifications/WebNotificationDelegate.h
+++ b/public/platform/modules/notifications/WebNotificationDelegate.h
@@ -12,7 +12,9 @@ namespace blink {
 // a delegate, as their events will be fired on a Service Worker instead.
 class WebNotificationDelegate {
 public:
+    // TODO(johnme): Remove this method once callers have switched to the one below.
     virtual void dispatchClickEvent() = 0;
+    virtual void dispatchClickEvent(int actionIndex) = 0;
     virtual void dispatchShowEvent() = 0;
     virtual void dispatchErrorEvent() = 0;
     virtual void dispatchCloseEvent() = 0;