Skip TimerQueriesTest.TimeElapsedMulticontextTest on all AMD
Skip TimerQueriesTest.TimeElapsedMulticontextTest on all AMD

Was skipped on Windows and Mac before, now seen flaky also on Linux.

BUG=angleproject:1541

Change-Id: Ic993eeadb104989416607271ce100b02aea7cecc
Reviewed-on: https://chromium-review.googlesource.com/603087
Reviewed-by: Yuly Novikov <36f5580f63d0a3eacc17e89a61d11e2f646630d2@chromium.org>
Commit-Queue: Yuly Novikov <36f5580f63d0a3eacc17e89a61d11e2f646630d2@chromium.org>

MSOpenTech/angle,MSOpenTech/angle,ecoal95/angle,ecoal95/angle,MSOpenTech/angle,ppy/angle,ecoal95/angle,ecoal95/angle,ppy/angle,MSOpenTech/angle,ecoal95/angle,ppy/angle,ppy/angle