Adds support for Linux and Android native EGL testing.
This can be useful for doing performance comparisons of ANGLE vs
a native GL driver. Only enabled for the trace perf tests due to
limitations in the test harness.

Bug: angleproject:4596
Change-Id: Iba6d3ccd7c1275cf095893fab824a0ea33dc3a79
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2116254
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>