Shape Detection: Implement FaceDetection on Mac as out-of-process service

services/shape_detection/public/interfaces/constants.mojom

Index: services/shape_detection/public/interfaces/constants.mojom
diff --git a/services/shape_detection/public/interfaces/constants.mojom b/services/shape_detection/public/interfaces/constants.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..85f919b49237c3870be40f17b54a2586f8555134
--- /dev/null
+++ b/services/shape_detection/public/interfaces/constants.mojom
@@ -0,0 +1,9 @@
+// Copyright 2017 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.
+
+// https://wicg.github.io/shape-detection-api/#api
+
+module shape_detection.mojom;
+
+const string kServiceName = "shape_detection";