Partially convert geolocation IPC to Mojo.

content/common/geolocation_service.mojom

+// 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.
+
+import "content/public/common/mojo_geoposition.mojom"
+
+module content {
+
+// The Geolocation service provides updates on the device's location to its
+// client. It starts providing updates once |StartUpdating()| is called and
+// continues until the connection is closed. |StartUpdating()| can be called
+// multiple times to change the accuracy with which the location is being
+// tracked.
+[Client=GeolocationServiceClient]
+interface GeolocationService {
+  StartUpdating(bool high_accuracy);
+};
+
+interface GeolocationServiceClient {
+  OnLocationUpdate(MojoGeoposition geoposition);
+};
+
+}