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Detect the GL_VENDOR string from the default GL implementation.
If it is the ATI proprietary driver then do not switch to EGL/GLES2
as there is a known bug and this driver crashes in eglInitialize
instead of failing properly.

BUG=822716

Cq-Include-Trybots: luci.chromium.try:linux_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I00b883012c31867f938bf3f68440058738bb312b
Reviewed-on: https://chromium-review.googlesource.com/966662
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543735}