Sort camera device list to use front camera first

media/capture/video/linux/video_capture_device_factory_linux.cc

Index: media/capture/video/linux/video_capture_device_factory_linux.cc
diff --git a/media/capture/video/linux/video_capture_device_factory_linux.cc b/media/capture/video/linux/video_capture_device_factory_linux.cc
index e1190478410a6c6321c0502a7dbd48e08b079774..8753a4acf7a522a386b8721e8ef0fe6ce6999cfc 100644
--- a/media/capture/video/linux/video_capture_device_factory_linux.cc
+++ b/media/capture/video/linux/video_capture_device_factory_linux.cc
@@ -228,6 +228,10 @@ void VideoCaptureDeviceFactoryLinux::GetDeviceDescriptors(
 #endif
     }
   }
+  // Since JS doesn't have API to get camera facing, we sort the list to make
+  // sure apps use the front camera by default.
+  // TODO(henryhsu): remove this after JS API completed (crbug.com/543997).
+  std::sort(device_descriptors->begin(), device_descriptors->end());
 }
 
 void VideoCaptureDeviceFactoryLinux::GetSupportedFormats(