Pass through geofencing API calls to the content layer.

public/platform/Platform.h

Index: public/platform/Platform.h
diff --git a/public/platform/Platform.h b/public/platform/Platform.h
index 8538892d297ab9e4ddacf128d7d9c15bdd1f19e6..99eb1083ad90e4e3ed41b33f7d8a9e2f01cd3630 100644
--- a/public/platform/Platform.h
+++ b/public/platform/Platform.h
@@ -74,6 +74,7 @@ class WebFallbackThemeEngine;
 class WebFileSystem;
 class WebFileUtilities;
 class WebFlingAnimator;
+class WebGeofencingProvider;
 class WebGestureCurveTarget;
 class WebGestureCurve;
 class WebGraphicsContext3DProvider;
@@ -631,6 +632,10 @@ public:
     virtual WebNotificationPresenter* notificationPresenter() { return 0; }
 
 
+    // Geofencing ---------------------------------------------------------
+
+    virtual WebGeofencingProvider* geofencingProvider() { return 0; }
+
 protected:
     virtual ~Platform() { }
 };