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We know that current context is set to null when the crash happens.
Getting the stack trace for the last call to SetCurrent will be helpful.

BUG=724999

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: Ie99e7c6cd0c9faa162cd0fc789c23d321256ded7
Reviewed-on: https://chromium-review.googlesource.com/780391Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Scott Graham <scottmg@chromium.org>
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519943}