Shape detection service: Add QR detection in Mac

services/shape_detection/barcode_detection_impl.cc

Index: services/shape_detection/barcode_detection_impl.cc
diff --git a/services/shape_detection/barcode_detection_impl.cc b/services/shape_detection/barcode_detection_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..edfb6b4d7b74433b9c896b3fde9ec079807876d8
--- /dev/null
+++ b/services/shape_detection/barcode_detection_impl.cc
@@ -0,0 +1,15 @@
+// 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.
+
+#include "services/shape_detection/barcode_detection_impl.h"
+
+namespace shape_detection {
+
+// static
+void BarcodeDetectionImpl::Create(
+    shape_detection::mojom::BarcodeDetectionRequest request) {
+  DLOG(ERROR) << "Platform not supported for Barcode Detection Service.";
+}
+
+}  // namespace shape_detection