It seems like there isn't a way to reference a local SVG in gitiles.
We'd need to upload the image to cloud storage. Instead we can use
the image in the repo if we link to the github version.

Bug: angleproject:3002
Change-Id: Ib1879d562e83ae16f531b204ca86cb73d45c5bb8
Reviewed-on: https://chromium-review.googlesource.com/c/1459600Reviewed-by: Jamie Madill <jmadill@chromium.org>