Allow tests to run on native EGL. 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>