Revert "Try Sleep(1) instead of Sleep(0) while waiting for queries." Caused significant slowdown in some chrome use cases that used glFinish or synchronous fences. BUG=532571 This reverts commit a53000b09b012235af228f2b4f48cc9fb477a45a. Change-Id: Id260e9ced472c409b2fa0b28b2b3dea99d412fdf Reviewed-on: https://chromium-review.googlesource.com/300491 Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>