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

webrtc/media/engine/fakewebrtcvideocapturemodule.h

Index: webrtc/media/engine/fakewebrtcvideocapturemodule.h
diff --git a/webrtc/media/engine/fakewebrtcvideocapturemodule.h b/webrtc/media/engine/fakewebrtcvideocapturemodule.h
index 0d5299922f1dd0a6c8634a1be075d0d2f55f0daf..3c4ff090a1923ed7b70c02606a2757d94e1efda9 100644
--- a/webrtc/media/engine/fakewebrtcvideocapturemodule.h
+++ b/webrtc/media/engine/fakewebrtcvideocapturemodule.h
@@ -72,7 +72,8 @@ class FakeWebRtcVideoCaptureModule : public webrtc::VideoCaptureModule {
     buffer->InitializeData();
     if (callback_) {
       callback_->OnFrame(
-          webrtc::VideoFrame(buffer, 0, 0, webrtc::kVideoRotation_0));
+          webrtc::VideoFrame(buffer, 0, 0, webrtc::kVideoRotation_0,
+                             webrtc::VideoContentType::kDefault));
     }
   }