Skip WebUiScreenLocker for Mash

BUG=888779
TEST=interactive_ui_tests --enable-features=SingleProcessMash

Change-Id: If0653a7dae1e7c156f122680fd6be71b001dd9f3
Reviewed-on: https://chromium-review.googlesource.com/1244300Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594147}

chrome/browser/chromeos/login/lock/screen_locker_browsertest.cc

@@ -34,6 +34,7 @@
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/test/ui_controls.h"
+#include "ui/base/ui_base_features.h"
 #include "ui/compositor/layer_animator.h"
 #include "ui/compositor/scoped_animation_duration_scale_mode.h"
 #include "ui/views/widget/widget.h"
@@ -150,6 +151,11 @@ class WebUiScreenLockerTest : public ScreenLockerTest {
 };
 
 IN_PROC_BROWSER_TEST_F(WebUiScreenLockerTest, TestBasic) {
+  // WebUiScreenLockerTest fails with Mash because of unexpected window
+  // structure. Fortunately we will deprecate the WebUI-based screen locker
+  // soon, so it is okay to skip it.  See https://crbug.com/888779
+  if (features::IsUsingWindowService())
+    return;
   ScreenLocker::Show();
   std::unique_ptr<test::ScreenLockerTester> tester(ScreenLocker::GetTester());
   tester->EmulateWindowManagerReady();
@@ -199,6 +205,11 @@ IN_PROC_BROWSER_TEST_F(ScreenLockerTest, LockScreenWhileAddingUser) {
 
 // Test how locking the screen affects an active fullscreen window.
 IN_PROC_BROWSER_TEST_F(WebUiScreenLockerTest, TestFullscreenExit) {
+  // WebUiScreenLockerTest fails with Mash because of unexpected window
+  // structure. Fortunately we will deprecate the WebUI-based screen locker
+  // soon, so it is okay to skip it.  See https://crbug.com/888779
+  if (features::IsUsingWindowService())
+    return;
   // 1) If the active browser window is in fullscreen and the fullscreen window
   // does not have all the pixels (e.g. the shelf is auto hidden instead of
   // hidden), locking the screen should not exit fullscreen. The shelf is