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..b438f738b04a7b0695f04a1c4156e702e54baf90 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"

[kcwu, 2016/11/28 10:11:37]

unused

[shenghao, 2016/11/29 10:22:27]

Done.

 #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"
 
@@ -45,20 +47,20 @@ class VideoCaptureDeviceLinux : public VideoCaptureDevice {
                        SetPhotoOptionsCallback callback) override;
 
  protected:
-  void SetRotation(int rotation);
+  virtual void SetRotation(int rotation);
+
+  const VideoCaptureDeviceDescriptor device_descriptor_;
 
  private:
   static int TranslatePowerLineFrequencyToV4L2(PowerLineFrequency frequency);
 
+  base::Thread v4l2_thread_;  // Thread used for reading data from the device.

[kcwu, 2016/11/28 10:11:37]

move to line 64 (keep it on original line)

[shenghao, 2016/11/29 10:22:27]

Done.

+
   // Internal delegate doing the actual capture setting, buffer allocation and
   // circulation with the V4L2 API. Created and deleted in the thread where
   // VideoCaptureDeviceLinux lives but otherwise operating on |v4l2_thread_|.
   scoped_refptr<V4L2CaptureDelegate> capture_impl_;
 
-  base::Thread v4l2_thread_;  // Thread used for reading data from the device.
-
-  const VideoCaptureDeviceDescriptor device_descriptor_;
-
   DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceLinux);
 };