Skip WindowSelectorControllerTest.OcclustionTest in single process mash

This also increased the timeout for test because it can take longer on asan.

TBR=hiroshige@chromium.org, xiyuan@chromium.org

Bug: 910303, 910105
Test: OcclustionTest is skipped in single process mash
Change-Id: I669d7343255980dd540c98aa645e5f14c641c371
Reviewed-on: https://chromium-review.googlesource.com/c/1355883Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612429}

ash/wm/overview/window_selector_controller_unittest.cc

@@ -244,7 +244,7 @@ TEST_F(WindowSelectorControllerTest, OcclusionTest) {
 
   Shell::Get()
       ->window_selector_controller()
-      ->set_occlusion_pause_duration_for_end_ms_for_test(50);
+      ->set_occlusion_pause_duration_for_end_ms_for_test(100);
   TestShellObserver observer(/*should_monitor_animation_state = */ true);
   ui::ScopedAnimationDurationScaleMode non_zero(
       ui::ScopedAnimationDurationScaleMode::NON_ZERO_DURATION);

testing/buildbot/filters/chromeos.single_process_mash.ash_unittests.filter

@@ -63,3 +63,6 @@
 
 # https://crbug.com/902171
 -NonClientFrameControllerMashTest.ContentRegionNotDrawnForClient
+
+# https://crbug.com/910303
+-WindowSelectorControllerTest.OcclusionTest