[webgl/video-upload] Support uploading from webcam/screen, and perf output.
[webgl/video-upload] Support uploading from webcam/screen, and perf output.

jdashg/misc,jdashg/misc,jdashg/misc,jdashg/snippets,jdashg/misc,jdashg/misc,jdashg/snippets,jdashg/misc