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Problem: When the GLVirtualContextsTest tests are run on a device with
Open GL ES 2.0, the tests fail during initialization because it tries
to re-initialize a GLManager (gl_real_) after failing to initialize as
content type ES 3.0. The problem being theat the gl_real_ is now in
an inconsistent state and cannot be initialized again.

Solution: Reset the GLManager (gl_real_) after failing to be
initialized as ES3, so that it can be re-tried as ES2.

Bug: None
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Idb0a6947baa80c3135418504e77458171eebe1fa
Reviewed-on: https://chromium-review.googlesource.com/999268Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548838}