chromeos: makes more tests run in both mash and ash

ash/sticky_keys/sticky_keys_overlay_unittest.cc

Index: ash/sticky_keys/sticky_keys_overlay_unittest.cc
diff --git a/ash/sticky_keys/sticky_keys_overlay_unittest.cc b/ash/sticky_keys/sticky_keys_overlay_unittest.cc
index 5a5c538271f778149c7faa5c199283cc5d5c6324..c6e2f5bccdcb3a555b9ed5816439fb71fd7b1151 100644
--- a/ash/sticky_keys/sticky_keys_overlay_unittest.cc
+++ b/ash/sticky_keys/sticky_keys_overlay_unittest.cc
@@ -4,6 +4,7 @@
 
 #include "ash/sticky_keys/sticky_keys_overlay.h"
 
+#include "ash/common/wm_shell.h"
 #include "ash/display/window_tree_host_manager.h"
 #include "ash/shell.h"
 #include "ash/sticky_keys/sticky_keys_controller.h"
@@ -45,6 +46,10 @@ TEST_F(StickyKeysOverlayTest, ModifierKeyState) {
 // This test addresses the crash report at crbug.com/435600, speculated to be
 // caused by using sticky keys with multiple displays.
 TEST_F(StickyKeysOverlayTest, OverlayNotDestroyedAfterDisplayRemoved) {
+  // TODO: investigate failure in mash, http://crbug.com/696006.
+  if (WmShell::Get()->IsRunningInMash())
+    return;
+
   // Add a secondary display to the left of the primary one.
   UpdateDisplay("1280x1024,1980x1080");
   display::DisplayIdList display_ids =