We'll call this function from the Chromium angle_end2end_tests main.
First this CL needs to roll into Chrome. Then we can make a second CL
in ANGLE to change the way the EGLContextCompatibilityTests are set up.

This is to break up the slow tests into smaller pieces. See the issue
for more details.

Bug: angleproject:4449
Change-Id: Icc10679c61fd2f7a5e396f7a310ffcfd0b45893b
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2082133
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>