Add the first very basic bits of a geofencing API.

Source/modules/geolocation/Geolocation.h

Index: Source/modules/geolocation/Geolocation.h
diff --git a/Source/modules/geolocation/Geolocation.h b/Source/modules/geolocation/Geolocation.h
index 21505eae29b9105bf6478c212173c18bc4342b85..557e794f9e5e8d2744562070fa4aa95ec0ea3d51 100644
--- a/Source/modules/geolocation/Geolocation.h
+++ b/Source/modules/geolocation/Geolocation.h
@@ -27,6 +27,7 @@
 #ifndef Geolocation_h
 #define Geolocation_h
 
+#include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "modules/geolocation/Geoposition.h"
@@ -42,6 +43,7 @@ namespace WebCore {
 class Dictionary;
 class Document;
 class LocalFrame;
+class GeofencingRegion;
 class GeolocationController;
 class GeolocationError;
 class GeolocationPosition;
@@ -82,6 +84,10 @@ public:
     // Notifies this that an error has occurred, it must be handled immediately.
     void setError(GeolocationError*);
 
+    ScriptPromise registerRegion(ScriptState*, GeofencingRegion*);
+    ScriptPromise unregisterRegion(ScriptState*, const String& regionId);
+    ScriptPromise getRegisteredRegions(ScriptState*) const;
+
 private:
     // Returns the last known position, if any. May return null.
     Geoposition* lastPosition();