Rotate frames correctly for back camera

media/capture/video/linux/video_capture_device_linux.h

Index: media/capture/video/linux/video_capture_device_linux.h
diff --git a/media/capture/video/linux/video_capture_device_linux.h b/media/capture/video/linux/video_capture_device_linux.h
index e8adbde8df41715bdd075c0c921c3f6446eb4383..2a0bc6842ca00a1db01e0d5ee9adeb66afac09c3 100644
--- a/media/capture/video/linux/video_capture_device_linux.h
+++ b/media/capture/video/linux/video_capture_device_linux.h
@@ -16,8 +16,10 @@
 
 #include "base/files/file_util.h"
 #include "base/files/scoped_file.h"
+#include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "base/threading/thread.h"
+#include "media/capture/video/linux/camera_characteristics.h"
 #include "media/capture/video/video_capture_device.h"
 #include "media/capture/video_capture_types.h"
 
@@ -59,6 +61,12 @@ class VideoCaptureDeviceLinux : public VideoCaptureDevice {
 
   const VideoCaptureDeviceDescriptor device_descriptor_;
 
+  base::LazyInstance<CameraCharacteristics> camera_characteristics_;
+
+  // True if the camera is world-facing. False if the camera is user-facing,
+  // external, or unknown.
+  bool is_back_camera_;
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceLinux);
 };