Reland: mus: Add views_mus_interactive_ui_tests target

ui/views/test/scoped_views_test_helper.cc

Index: ui/views/test/scoped_views_test_helper.cc
diff --git a/ui/views/test/scoped_views_test_helper.cc b/ui/views/test/scoped_views_test_helper.cc
index 8a65e0ebf61224cc945e07d0b60b5b7930431a3a..624fb7e1c21a5508366c3bc3aa29e690f55fb164 100644
--- a/ui/views/test/scoped_views_test_helper.cc
+++ b/ui/views/test/scoped_views_test_helper.cc
@@ -44,7 +44,7 @@ ScopedViewsTestHelper::ScopedViewsTestHelper(
   // context-factory is used when creating Widgets (to set-up the compositor for
   // the corresponding mus::Windows). So unset the context-factory, so that
   // NativeWidgetMus installs the correct context-factory that can talk to mus.
-  if (platform_test_helper_->IsMus())
+  if (PlatformTestHelper::IsMus())
     aura::Env::GetInstance()->set_context_factory(nullptr);
 #endif
 
@@ -69,8 +69,4 @@ gfx::NativeWindow ScopedViewsTestHelper::GetContext() {
   return test_helper_->GetContext();
 }
 
-bool ScopedViewsTestHelper::IsMus() const {
-  return platform_test_helper_->IsMus();
-}
-
 }  // namespace views