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The test seems to be timing out while taking a page screenshot after
the test completes, and this isn't the important part of the test.
Instead, rewrite it as a context_lost test, and include two variants:

  ContextLost_WorkerRAFAfterGPUCrash
  ContextLost_WorkerRAFAfterGPUCrash_OOPD

Tbr: fserb@chromium.org
Bug: 851213
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;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Ib1556ad9f693003b6b216085a0b1665cad017314
Reviewed-on: https://chromium-review.googlesource.com/1197942Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587829}