content_browsertests will now use fake webrtc devices.

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 MediaStreamDeviceSettings for permission to
 //    use devices and for which device to use.
@@ skipping 130 matching lines @@
   virtual void DevicesAccepted(const std::string& label,
                                const StreamDeviceInfoArray& devices) OVERRIDE;
   virtual void SettingsError(const std::string& label) 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.
-  // TODO(xians): Remove this hack since we can create our own
-  // MediaStreamManager in our unit tests.
   void UseFakeDevice();
 
+  // Call to have all GenerateStream calls from now on use fake devices instead
+  // of real ones. This should NOT be used in production versions of Chrome.
+  static void AlwaysUseFakeDevice();
+
   // This object gets deleted on the UI thread after the IO thread has been
   // destroyed. So we need to know when IO thread is being destroyed so that
   // we can delete VideoCaptureManager and AudioInputDeviceManager.
   virtual void WillDestroyCurrentMessageLoop() OVERRIDE;
 
  private:
   // Contains all data needed to keep track of requests.
   struct DeviceRequest;
 
   // Cache enumerated device list.
@@ skipping 57 matching lines @@
   int active_enumeration_ref_count_[content::NUM_MEDIA_STREAM_DEVICE_TYPES];
 
   // All non-closed request.
   typedef std::map<std::string, DeviceRequest> DeviceRequests;
   DeviceRequests requests_;
 
   // Hold a pointer to the IO loop to check we delete the device thread and
   // managers on the right thread.
   MessageLoop* io_loop_;
 
+  // Static members.
+  static bool always_use_fake_devices_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaStreamManager);
 };
 
 }  // namespace media_stream
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_MANAGER_H_