Shape detection service: Add QR detection in Mac

services/shape_detection/BUILD.gn

 # 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.
 
 import("//services/service_manager/public/cpp/service.gni")
 import("//services/service_manager/public/service_manifest.gni")
 
 source_set("lib") {
   sources = [
+    "barcode_detection_impl.h",
     "face_detection_provider_impl.h",
     "shape_detection_service.cc",
     "shape_detection_service.h",
   ]
 
   if (is_mac) {
     sources += [
+      "barcode_detection_impl_mac.h",
+      "barcode_detection_impl_mac.mm",
+      "detection_utils_mac.h",
+      "detection_utils_mac.mm",
       "face_detection_impl_mac.h",
       "face_detection_impl_mac.mm",
     ]
+    libs = [ "QuartzCore.framework" ]
   } else {
-    sources += [ "face_detection_provider_impl.cc" ]
+    sources += [
+      "barcode_detection_impl.cc",
+      "face_detection_provider_impl.cc",
+    ]
   }
 
   deps = [
     "//mojo/public/cpp/bindings",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 
   public_deps = [
     "//base",
     "//media/capture",
     "//services/service_manager/public/cpp",
     "//services/shape_detection/public/interfaces",
   ]
 }
 
 service_manifest("manifest") {
   name = "shape_detection"
   source = "manifest.json"
 }