Disable WorkspaceLayoutManagerBackdropTest.OpenAppListInOverviewMode in asan.

Bug: 838756, 838822, 837092
Change-Id: I9f7fcb79a8305632ca264324f69aee1ae7d2ac71
Reviewed-on: https://chromium-review.googlesource.com/1042868Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Min Chen <minch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556132}

ash/wm/workspace/workspace_layout_manager_unittest.cc

@@ -1547,8 +1547,13 @@ TEST_F(WorkspaceLayoutManagerBackdropTest,
   GetAppListTestHelper()->Dismiss();
 }
 
-// TODO(minch): This test has a high flake rate. https://crbug.com/838756
-TEST_F(WorkspaceLayoutManagerBackdropTest, DISABLED_OpenAppListInOverviewMode) {
+// TODO(crbug.com/803286): The npot texture check failed on asan tests bot.
+#if defined(ADDRESS_SANITIZER)
+#define MAYBE_OpenAppListInOverviewMode DISABLED_OpenAppListInOverviewMode
+#else
+#define MAYBE_OpenAppListInOverviewMode OpenAppListInOverviewMode
+#endif
+TEST_F(WorkspaceLayoutManagerBackdropTest, MAYBE_OpenAppListInOverviewMode) {
   WorkspaceController* wc = ShellTestApi(Shell::Get()).workspace_controller();
   WorkspaceControllerTestApi test_helper(wc);