This test has been helpful because of its simple, very-predictable
color pattern. The red component corresponds to the x-axis, and green
to the y-axis. Red and green values will increment by 1, from 0 to
255/0xFF, as it goes further away from the lower-left corner.
Bug: angleproject:4436
Bug: angleproject:4431
Bug: b/150329975
Bug: b/150329969
Change-Id: I76ac866d36036257810f77adf9b4e28bcdcc28d0
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2185747
Commit-Queue: Ian Elliott <ianelliott@google.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
