Change sync objects to not be available in the current frame.

(Manual M65 merge-back)

Follows similar restrictions for query objects and implements
https://github.com/KhronosGroup/WebGL/pull/2598 .

Disable EXT_disjoint_timer_query at the WebGL level.

TBR=dcheng@chromium.org, kainino@chromium.org, piman@chromium.org, zmo@chromium.org

Bug: 808744
Change-Id: Ibf27298392cabb87fa0222e18145682a55392997
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
Reviewed-on: https://chromium-review.googlesource.com/919154
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/branch-heads/3325@{#464}
Cr-Branched-From: bc084a8b5afa3744a74927344e304c02ae54189f-refs/heads/master@{#530369}
29 files changed