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

Follows similar restrictions for query objects and implements .

Disable EXT_disjoint_timer_query at the WebGL level.

Bug: 808744
Change-Id: I178f08fd30bf252865abf2744636b4e9b3a0e677
Commit-Queue: Kenneth Russell <>
Reviewed-by: Daniel Cheng <>
Reviewed-by: Kai Ninomiya <>
Reviewed-by: Antoine Labour <>
Reviewed-by: Zhenyao Mo <>
Cr-Commit-Position: refs/heads/master@{#535327}
27 files changed