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Also add some helpers to allow running the gl_tests with EGL / GLES2.

BUG=584248
TEST=gl_tests --gtest_filter=*GpuOESEGLImageTest.EGLImageToTexture*

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I5177062eb7c28b59fc2684ef7fc665271b53c12d
Reviewed-on: https://chromium-review.googlesource.com/958908Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543403}