Disable flaky ash_unittests SplitViewControllerTest.OverviewExitAnima…

…tionTest

Failed 4 cycles at https://ci.chromium.org/ui/p/chrome/builders/ci/linux-chromeos-chrome

Bug: b/252512416
Change-Id: Ie0f61645c85000f19de5b9db4062d86fceeb44b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5058370
Owners-Override: Trent Apted <tapted@chromium.org>
Reviewed-by: Ben Reich <benreich@chromium.org>
Commit-Queue: Ben Reich <benreich@chromium.org>
Auto-Submit: Trent Apted <tapted@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1228645}

ash/wm/splitview/split_view_controller_unittest.cc

@@ -2513,7 +2513,8 @@ TEST_F(SplitViewControllerTest, ShadowDisappearsWhenSnapped) {
 // windows in overview mode to snap to both side of the screen), or toggle
 // overview to end overview causes a window to snap, we should not have the
 // exiting animation.
-TEST_F(SplitViewControllerTest, OverviewExitAnimationTest) {
+// Flaky. See b/252512416.
+TEST_F(SplitViewControllerTest, DISABLED_OverviewExitAnimationTest) {
   ui::ScopedAnimationDurationScaleMode anmatin_scale(
       ui::ScopedAnimationDurationScaleMode::NON_ZERO_DURATION);