GitLab

I suspect that the flakiness was caused by X11WholeScreenMoveLoop::RunMoveLoop()
sometimes failing. This CL fixes this potential source of flakiness by using
a stub move loop in tests.

BUG=396468
TEST=None
TBR=erg

Review URL: https://codereview.chromium.org/431973006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287622 0039d316-1c4b-4281-b951-d872f2087c98