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

public/platform/WebGeofencingProvider.h

Index: public/platform/WebGeofencingProvider.h
diff --git a/public/platform/WebGeofencingProvider.h b/public/platform/WebGeofencingProvider.h
index b710bc813a7afa3b2cb62efdd5221f8b54f416c1..d8edcbf48c0486fb11c3596c44f3e1f9cb5fad30 100644
--- a/public/platform/WebGeofencingProvider.h
+++ b/public/platform/WebGeofencingProvider.h
@@ -13,6 +13,7 @@ namespace blink {
 struct WebCircularGeofencingRegion;
 struct WebGeofencingError;
 struct WebGeofencingRegistration;
+class WebServiceWorkerRegistration;
 class WebString;
 
 typedef WebCallbacks<void, WebGeofencingError> WebGeofencingCallbacks;
@@ -24,15 +25,18 @@ public:
 
     // 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