Caused significant slowdown in some chrome use cases that used glFinish or synchronous fences. BUG=532571 This reverts commit a53000b0. Change-Id: Id260e9ced472c409b2fa0b28b2b3dea99d412fdf Reviewed-on: https://chromium-review.googlesource.com/300491Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>
