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Instrument GLES2DecoderImpl::DoCommandsImpl to
- record in a crash key all of the GL commands that have been flushed
- flush at the end of every time that it is called

This will severely regress performance.

What we hope to learn:
- There's a good chance this will make the bug vanish (egregious glFlush
  calls have been known to do this), in which case we'll learn nothing.
  - But maybe we can add less egregious glFlush calls to avoid the issue
    in Chrome 69
- If elevated crash rates persist, hopefully this will point to a particular
  call or sequence of calls that is causing the crash

Bug: 863817
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: I462fab8a6d86ee3896dcd9c0c3c4aa68f9de0a69
Reviewed-on: https://chromium-review.googlesource.com/1159831
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580213}