Blink side of exposing the service worker registration associated with geofencing API calls.

public/platform/WebGeofencingProvider.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebGeofencingProvider_h
 #define WebGeofencingProvider_h
 
 #include "public/platform/WebCallbacks.h"
 #include "public/platform/WebVector.h"
 
 namespace blink {
 
 struct WebCircularGeofencingRegion;
 struct WebGeofencingError;
 struct WebGeofencingRegistration;
+class WebServiceWorkerRegistration;
 class WebString;
 
 typedef WebCallbacks<void, WebGeofencingError> WebGeofencingCallbacks;
 typedef WebCallbacks<WebVector<WebGeofencingRegistration>, WebGeofencingError> WebGeofencingRegionsCallbacks;
 
 class WebGeofencingProvider {
 public:
     virtual ~WebGeofencingProvider() { }
 
     // Registers a region.
     // Ownership of the WebGeofencingCallbacks is transferred to the client.
-    virtual void registerRegion(const WebString& regionId, const WebCircularGeofencingRegion&, WebGeofencingCallbacks*) = 0;
+    virtual void registerRegion(const WebString& regionId, const WebCircularGeofencingRegion&, WebGeofencingCallbacks*) { }
+    virtual void registerRegion(const WebString& regionId, const WebCircularGeofencingRegion&, WebServiceWorkerRegistration*, WebGeofencingCallbacks*) { }
 
     // Unregisters a region.
     // Ownership of the WebGeofencingCallbacks is transferred to the client.
-    virtual void unregisterRegion(const WebString& regionId, WebGeofencingCallbacks*) = 0;
+    virtual void unregisterRegion(const WebString& regionId, WebGeofencingCallbacks*) { }
+    virtual void unregisterRegion(const WebString& regionId, WebServiceWorkerRegistration*, WebGeofencingCallbacks*) { }
 
     // Returns all the currently registered regions.
     // Ownership of the WebGeofencingRegionsCallbacks is transferred to the client.
-    virtual void getRegisteredRegions(WebGeofencingRegionsCallbacks*) = 0;
+    virtual void getRegisteredRegions(WebGeofencingRegionsCallbacks*) { }
+    virtual void getRegisteredRegions(WebServiceWorkerRegistration*, WebGeofencingRegionsCallbacks*) { }
 };
 
 } // namespace blink
 
 #endif // WebGeofencingProvider_h