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This provides a best-effort interface to retrieve the time at which
a GLFence changed state. This is useful for getting a render time
estimate without having to poll the fence or actively waiting for it
to signal.

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;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I4df20684fdaeb0f39b36fb72bd1d65a2766952fd
Reviewed-on: https://chromium-review.googlesource.com/1030049Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Commit-Queue: Biao She <bshe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554831}