Extract VideoCaptureDeviceFactory out of VideoCaptureDevice and use for File and FakeVCD.

content/browser/renderer_host/media/media_stream_manager.h

 // Copyright (c) 2012 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.
 
 // MediaStreamManager is used to open/enumerate media capture devices (video
 // supported now). Call flow:
 // 1. GenerateStream is called when a render process wants to use a capture
 //    device.
 // 2. MediaStreamManager will ask MediaStreamUIController for permission to
 //    use devices and for which device to use.
 // 3. MediaStreamManager will request the corresponding media device manager(s)
 //    to enumerate available devices. The result will be given to
 //    MediaStreamUIController.
 // 4. MediaStreamUIController will, by posting the request to UI, let the
 //    users to select which devices to use and send callback to
 //    MediaStreamManager with the result.
 // 5. MediaStreamManager will call the proper media device manager to open the
 //    device and let the MediaStreamRequester know it has been done.
 
+// If either user or test harness selects --use-fake-device-for-media-stream,
+// a fake video device or devices are used instead of real ones.
+
 // When enumeration and open are done in separate operations,
 // MediaStreamUIController is not involved as in steps.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_MANAGER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_MANAGER_H_
 
 #include <map>
 #include <set>
 #include <string>
 
@@ skipping 124 matching lines @@
                       int capture_session_id) OVERRIDE;
   virtual void Closed(MediaStreamType stream_type,
                       int capture_session_id) OVERRIDE;
   virtual void DevicesEnumerated(MediaStreamType stream_type,
                                  const StreamDeviceInfoArray& devices) OVERRIDE;
 
   // Implements base::SystemMonitor::DevicesChangedObserver.
   virtual void OnDevicesChanged(
       base::SystemMonitor::DeviceType device_type) OVERRIDE;
 
-  // Used by unit test to make sure fake devices are used instead of a real
-  // devices, which is needed for server based testing or certain tests (which
-  // can pass --use-fake-device-for-media-stream).
-  void UseFakeDevice();
-
   // Called by the tests to specify a fake UI that should be used for next
   // generated stream (or when using --use-fake-ui-for-media-stream).
   void UseFakeUI(scoped_ptr<FakeMediaStreamUIProxy> fake_ui);
 
   // Returns all devices currently opened by a request with label |label|.
   // If no request with |label| exist, an empty array is returned.
   StreamDeviceInfoArray GetDevicesOpenedByRequest(
       const std::string& label) const;
 
   // This object gets deleted on the UI thread after the IO thread has been
@@ skipping 202 matching lines @@
 
   bool use_fake_ui_;
   scoped_ptr<FakeMediaStreamUIProxy> fake_ui_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_MANAGER_H_