Add the first very basic bits of a geofencing API.

Source/modules/geolocation/CircularRegion.h

Index: Source/modules/geolocation/CircularRegion.h
diff --git a/Source/modules/geolocation/CircularRegion.h b/Source/modules/geolocation/CircularRegion.h
new file mode 100644
index 0000000000000000000000000000000000000000..c84392ef6dc4163a25b8600e953bebf90d760abc
--- /dev/null
+++ b/Source/modules/geolocation/CircularRegion.h
@@ -0,0 +1,46 @@
+// 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 CircularRegion_h
+#define CircularRegion_h
+
+#include "modules/geolocation/GeofencingRegion.h"
+
+namespace WebCore {
+
+class Dictionary;
+
+struct CircularRegionInit {
+    CircularRegionInit() : latitude(0), longitude(0), radius(0) { }
+    explicit CircularRegionInit(const Dictionary& init);
+
+    String id;
+    double latitude;
+    double longitude;
+    double radius;
+};
+
+class CircularRegion FINAL : public GeofencingRegion {
+    WTF_MAKE_NONCOPYABLE(CircularRegion);
+public:
+    static CircularRegion* create(const Dictionary& init);
+    virtual ~CircularRegion() { }
+
+    double latitude() const { return m_latitude; }
+    double longitude() const { return m_longitude; }
+    double radius() const { return m_radius; }
+
+    virtual void trace(Visitor* visitor) OVERRIDE { GeofencingRegion::trace(visitor); }
+
+private:
+    explicit CircularRegion(const CircularRegionInit&);
+
+    double m_latitude;
+    double m_longitude;
+    double m_radius;
+};
+
+} // namespace WebCore
+
+#endif