Do not rotate frames from external cameras

media/capture/video/linux/video_capture_device_chromeos.cc

Index: media/capture/video/linux/video_capture_device_chromeos.cc
diff --git a/media/capture/video/linux/video_capture_device_chromeos.cc b/media/capture/video/linux/video_capture_device_chromeos.cc
index 7003990ad5ee26c23d5dfc2445e6dc2e49cd5f37..3ba9f50330cc058623e577a62f8faadc5fbc7d30 100644
--- a/media/capture/video/linux/video_capture_device_chromeos.cc
+++ b/media/capture/video/linux/video_capture_device_chromeos.cc
@@ -110,16 +110,20 @@ VideoCaptureDeviceChromeOS::VideoCaptureDeviceChromeOS(
                                              device_descriptor.model_id)),
       camera_orientation_(
           GetCameraConfig()->GetOrientation(device_descriptor.device_id,
-                                            device_descriptor.model_id)) {}
+                                            device_descriptor.model_id)),
+      // External cameras have lens_facing as MEDIA_VIDEO_FACING_NONE.
+      // We don't want to rotate the frame even if the device rotates.
+      rotates_with_device_(lens_facing_ !=
+                           VideoFacingMode::MEDIA_VIDEO_FACING_NONE) {}
 
 VideoCaptureDeviceChromeOS::~VideoCaptureDeviceChromeOS() {
   screen_observer_delegate_->RemoveObserver();
 }
 
 void VideoCaptureDeviceChromeOS::SetRotation(int rotation) {
-  // We assume external camera is facing the users. If not, the users can
-  // rotate the camera manually by themselves.
-  if (lens_facing_ == VideoFacingMode::MEDIA_VIDEO_FACING_ENVIRONMENT) {
+  if (!rotates_with_device_) {
+    rotation = 0;
+  } else if (lens_facing_ == VideoFacingMode::MEDIA_VIDEO_FACING_ENVIRONMENT) {
     // Original frame when |rotation| = 0
     // -----------------------
     // |          *          |
@@ -153,7 +157,8 @@ void VideoCaptureDeviceChromeOS::SetRotation(int rotation) {
     // Therefore, for back camera, we need to rotate (360 - |rotation|).
     rotation = (360 - rotation) % 360;
   }
-  // Take into account camera orientation w.r.t. the display.
+  // Take into account camera orientation w.r.t. the display. External cameras
+  // would have camera_orientation_ as 0.
   rotation = (rotation + camera_orientation_) % 360;
   VideoCaptureDeviceLinux::SetRotation(rotation);
 }