Shape detection service: Add QR detection in Mac

services/shape_detection/barcode_detection_impl.h

+// 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.
+
+#ifndef SERVICES_SHAPE_DETECTION_BARCODE_DETECTION_IMPL_H_
+#define SERVICES_SHAPE_DETECTION_BARCODE_DETECTION_IMPL_H_
+
+#include "services/shape_detection/public/interfaces/barcodedetection.mojom.h"
+
+namespace shape_detection {
+
+class BarcodeDetectionImpl {
+ public:
+  static void Create(shape_detection::mojom::BarcodeDetectionRequest request);
+
+ private:
+  ~BarcodeDetectionImpl() = default;
+
+  DISALLOW_COPY_AND_ASSIGN(BarcodeDetectionImpl);
+};
+
+}  // namespace shape_detection
+
+#endif  // SERVICES_SHAPE_DETECTION_BARCODE_DETECTION_IMPL_H_