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

services/shape_detection/shape_detection_service.cc

+// 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.
+
+#include "services/shape_detection/shape_detection_service.h"
+
+#include "base/macros.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+#include "services/service_manager/public/cpp/interface_registry.h"
+#include "services/service_manager/public/cpp/service_context.h"
+#include "services/shape_detection/face_detection_impl.h"
+
+namespace shape_detection {
+
+std::unique_ptr<service_manager::Service> ShapeDetectionService::Create() {
+  return base::MakeUnique<ShapeDetectionService>();
+}
+
+ShapeDetectionService::ShapeDetectionService() = default;
+
+ShapeDetectionService::~ShapeDetectionService() = default;
+
+void ShapeDetectionService::OnStart() {
+  ref_factory_.reset(new service_manager::ServiceContextRefFactory(
+      base::Bind(&service_manager::ServiceContext::RequestQuit,
+                 base::Unretained(context()))));
+}
+
+bool ShapeDetectionService::OnConnect(
+    const service_manager::ServiceInfo& remote_info,
+    service_manager::InterfaceRegistry* registry) {
+  registry->AddInterface(base::Bind(&FaceDetectionImpl::Create));

[Ken Rockot(use gerrit already), 2016/12/05 20:56:52]

While I would like to avoid every service needing to do this, I don't have a
better solution yet: Can you please copy the pattern applied to the
image_decoder service here
(https://cs.chromium.org/chromium/src/services/image_decoder/image_decoder_ser...),
i.e. add a connection error handler to |registry| which is bound to a
ServiceContextRef? This ensures that the registry connection itself holds a ref
to the service.

[xianglu, 2016/12/05 22:13:22]

Done.

+  return true;
+}
+
+bool ShapeDetectionService::OnStop() {
+  return true;
+}
+
+}  // namespace shape_detection