Add content type information to encoded images and corresponding rtp extension header

webrtc/api/video/video_frame.h

Index: webrtc/api/video/video_frame.h
diff --git a/webrtc/api/video/video_frame.h b/webrtc/api/video/video_frame.h
index 8840782cad03ba70e69657b227e8ddf7aabfbcb3..c6eb91e9e0547225516662742ad0d6e25016799c 100644
--- a/webrtc/api/video/video_frame.h
+++ b/webrtc/api/video/video_frame.h
@@ -14,6 +14,7 @@
 #include <stdint.h>
 
 #include "webrtc/api/video/video_rotation.h"
+#include "webrtc/api/video/video_content_type.h"
 #include "webrtc/api/video/video_frame_buffer.h"
 
 // TODO(nisse): Transition hack, some downstream applications expect
@@ -30,13 +31,15 @@ class VideoFrame {
   // want to stick to this style and deprecate the other constructor.
   VideoFrame(const rtc::scoped_refptr<VideoFrameBuffer>& buffer,
              webrtc::VideoRotation rotation,
+             VideoContentTypeId content_type,
              int64_t timestamp_us);
 
   // Preferred constructor.
   VideoFrame(const rtc::scoped_refptr<VideoFrameBuffer>& buffer,
              uint32_t timestamp,
              int64_t render_time_ms,
-             VideoRotation rotation);
+             VideoRotation rotation,
+             VideoContentTypeId content_type);
 
   ~VideoFrame();
 
@@ -92,6 +95,11 @@ class VideoFrame {
   VideoRotation rotation() const { return rotation_; }
   void set_rotation(VideoRotation rotation) { rotation_ = rotation; }
 
+  VideoContentTypeId content_type() const { return content_type_; }
+  void set_content_type(VideoContentTypeId content_type) {
+    content_type_ = content_type;
+  }
+
   // Get render time in milliseconds.
   // TODO(nisse): Deprecated. Migrate all users to timestamp_us().
   int64_t render_time_ms() const;
@@ -113,6 +121,7 @@ class VideoFrame {
   int64_t ntp_time_ms_;
   int64_t timestamp_us_;
   VideoRotation rotation_;
+  VideoContentTypeId content_type_;
 };
 
 }  // namespace webrtc