Blink implementation of PushManager#hasPermission()

public/platform/WebPushClient.h

Index: public/platform/WebPushClient.h
diff --git a/public/platform/WebPushClient.h b/public/platform/WebPushClient.h
index 3804bd2deff91e690484a0e0375de9ac15cb15dd..7904b9337bbb5b2a8a805a51ed231a3af3d60b3b 100644
--- a/public/platform/WebPushClient.h
+++ b/public/platform/WebPushClient.h
@@ -7,10 +7,10 @@
 
 #include "public/platform/WebCallbacks.h"
 #include "public/platform/WebPushError.h"
-#include "public/platform/WebString.h"
 
 namespace blink {
 
+class WebPushPermissionCallback;
 class WebServiceWorkerProvider;
 struct WebPushRegistration;
 
@@ -23,6 +23,10 @@ public:
     // Ownership of the WebPushRegistrationCallbacks is transferred to the
     // client. Ownership of the WebServiceWorkerProvider is not transferred.
     virtual void registerPushMessaging(const WebString& senderId, WebPushRegistrationCallbacks*, WebServiceWorkerProvider*) { }
+
+    // Ownership of the WebPushPermissionCallback is transferred to the
+    // client. Ownership of the WebServiceWorkerProvider is not transferred.
+    virtual void getPermissionStatus(WebPushPermissionCallback*, WebServiceWorkerProvider*) { }
 };
 
 } // namespace blink