| Index: media/capture/video/video_capture_system.h | 
| diff --git a/media/capture/video/video_capture_system.h b/media/capture/video/video_capture_system.h | 
| index b0b6313123babdbc56bb1510348800c30ca1df0d..54b2dca704c4ea4bdd09f7675053943063e68145 100644 | 
| --- a/media/capture/video/video_capture_system.h | 
| +++ b/media/capture/video/video_capture_system.h | 
| @@ -10,6 +10,8 @@ | 
|  | 
| namespace media { | 
|  | 
| +// GetDeviceInfosAsync() must be called at least once before calling | 
| +// CreateDevice(). | 
| class CAPTURE_EXPORT VideoCaptureSystem { | 
| public: | 
| using DeviceInfoCallback = | 
|  |