Adds EngineGeolocationFeature for Blimp Geolocation project.

blimp/common/proto/common.proto

Index: blimp/common/proto/common.proto
diff --git a/cc/proto/vector2d.proto b/blimp/common/proto/common.proto
similarity index 70%
copy from cc/proto/vector2d.proto
copy to blimp/common/proto/common.proto
index 15171844ffc443d28cae7c70e2149ac3989200ab..2684302d65efa3c23ef949c266c2ec6081f20e77 100644
--- a/cc/proto/vector2d.proto
+++ b/blimp/common/proto/common.proto
@@ -1,14 +1,13 @@
 // Copyright 2016 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.
+//
+// Message definitions shared across proto files.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
-package cc.proto;
+package blimp;
 
-message Vector2d {
-  optional int64 x = 1;
-  optional int64 y = 2;
-}
+message EmptyMessage {}