Update dirty bits flow example.
Update dirty bits flow example.

Had an incorrect label for the gl::Context and was missing a
few edges for new connections.

Bug: None
Change-Id: I037551f8f0a6559b9c522ae192b1cd93edf9bcf0
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2223815
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Commit-Queue: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

ppy/angle,ppy/angle,ppy/angle,ppy/angle