Disable flaky SitePerProcess[HighDPI]HitTestBrowserTest tests

Disables:
- ScrollEventToOOPIF on TSAN
- OverlapSurfaceHitTestTest on Linux (was: TSAN)
- HitTestWatermark on Linux (was: TSAN)
- HitTestLayerSquashing on Linux
- CrossProcessMouseCapture on Linux

TBR=kenrb@chromium.org

Bug: 833380
Change-Id: Ia8539488479c19e0dbeacf6bc0c16667f325ebd9
Reviewed-on: https://chromium-review.googlesource.com/1056775
Reviewed-by: Timothy Loh <timloh@chromium.org>
Commit-Queue: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558187}
1 file changed