Plumb Push API permission request through Blink using Frame.

public/web/WebFrameClient.h

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 39 matching lines @@
 #include "public/platform/WebStorageQuotaType.h"
 #include "public/platform/WebURLError.h"
 #include "public/platform/WebURLRequest.h"
 #include <v8.h>
 
 namespace blink {
 
 class WebApplicationCacheHost;
 class WebApplicationCacheHostClient;
 class WebCachedURLRequest;
+class WebCallback;
 class WebColorChooser;
 class WebColorChooserClient;
 class WebContentDecryptionModule;
 class WebCookieJar;
 class WebDataSource;
 class WebDOMEvent;
 class WebExternalPopupMenu;
 class WebExternalPopupMenuClient;
 class WebFormElement;
 class WebGeolocationClient;
@@ skipping 248 matching lines @@
     // Web Notifications ---------------------------------------------------
 
     // Requests permission to display platform notifications on the origin of this frame.
     virtual void requestNotificationPermission(const WebSecurityOrigin&, WebNotificationPermissionCallback* callback) { }
 
     // Called to retrieve the provider of desktop notifications.
     // FIXME: Remove this method once the presenter is obtained through Platform.
     virtual WebNotificationPresenter* notificationPresenter() { return 0; }
 
 
+    // Push API ---------------------------------------------------
+
+    // Requests permission to use the Push API in the origin of this frame.
+    virtual void requestPushPermission(WebCallback* callback) { }
+
+
     // Editing -------------------------------------------------------------
 
     // These methods allow the client to intercept and overrule editing
     // operations.
     virtual void didChangeSelection(bool isSelectionEmpty) { }
 
 
     // Dialogs -------------------------------------------------------------
 
     // This method opens the color chooser and returns a new WebColorChooser
@@ skipping 241 matching lines @@
     // associated with the WebDataSource.
     virtual int64_t serviceWorkerID(WebDataSource&) { return -1; }
 
 protected:
     virtual ~WebFrameClient() { }
 };
 
 } // namespace blink
 
 #endif