Add rotation to EncodedImage and make sure it is passed through encoders.

webrtc/video_frame.h

Index: webrtc/video_frame.h
diff --git a/webrtc/video_frame.h b/webrtc/video_frame.h
index b5e13f039b0cd6c7f7f2920cab126124c39039a9..3ec47c6c751d2bcd6d7565bcff59f524bc3d9043 100644
--- a/webrtc/video_frame.h
+++ b/webrtc/video_frame.h
@@ -157,6 +157,7 @@ class EncodedImage {
   static size_t GetBufferPaddingBytes(VideoCodecType codec_type);
 
   EncodedImage() : EncodedImage(nullptr, 0, 0) {}
+
   EncodedImage(uint8_t* buffer, size_t length, size_t size)
       : _buffer(buffer), _length(length), _size(size) {}
 
@@ -182,6 +183,7 @@ class EncodedImage {
   uint8_t* _buffer;
   size_t _length;
   size_t _size;
+  VideoRotation rotation_ = kVideoRotation_0;
   bool _completeFrame = false;
   AdaptReason adapt_reason_;
   int qp_ = -1;  // Quantizer value.