cros: Enable some tests in //ash/wm in ash_unittests --mash

For the ones that fail, disable them via filter file instead of in the
code, per our disablement policy.

Bug: 698085, 695556, 698878, 698888, 698093, 698894
Test: ash_unittests --mash
Change-Id: Ic145ab6a95508968d6884d14fac2a3ca08888d26
Reviewed-on: https://chromium-review.googlesource.com/752423
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513836}
  PanelWindowResizerTransientTest() : transient_window_type_(GetParam()) {}

  PanelWindowResizerTransientTest() : transient_window_type_(GetParam()) {}
