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

content/browser/shapedetection/face_detection_service_dispatcher.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 CONTENT_BROWSER_SHAPEDETECTION_FACE_DETECTION_SERVICE_DISPATCHER_H_
+#define CONTENT_BROWSER_SHAPEDETECTION_FACE_DETECTION_SERVICE_DISPATCHER_H_
+
+#include "content/common/content_export.h"
+#include "services/shape_detection/public/interfaces/facedetection_provider.mojom.h"
+
+namespace content {
+
+class RenderFrameHost;
+
+// Because the renderer cannot launch an out-of-process service on its own, we
+// use |FaceDetectionServiceDispatcher| to forward requests to Service Manager,
+// which then starts Face Detection Service in a utility process.
+class CONTENT_EXPORT FaceDetectionServiceDispatcher {
+ public:
+  FaceDetectionServiceDispatcher();
+  ~FaceDetectionServiceDispatcher();
+
+  static void CreateMojoService(
+      RenderFrameHost* render_frame_host,
+      shape_detection::mojom::FaceDetectionProviderRequest request);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_SHAPEDETECTION_FACE_DETECTION_SERVICE_DISPATCHER_H_