Disables tooltip tests for aura-mus-client

ui/views/test/views_test_base.h

Index: ui/views/test/views_test_base.h
diff --git a/ui/views/test/views_test_base.h b/ui/views/test/views_test_base.h
index 04dfab394f8e005d5e64ee5dad8a42e9b5ce1b03..1b7d171903b2dd09f1609b8c46a27283d47db903 100644
--- a/ui/views/test/views_test_base.h
+++ b/ui/views/test/views_test_base.h
@@ -32,6 +32,10 @@ class ViewsTestBase : public PlatformTest {
   // Whether the test is running under mus.
   static bool IsMus();
 
+  // Returns true if running aura-mus in a client configuration (not the window
+  // manager).
+  static bool IsAuraMusClient();
+
   // testing::Test:
   void SetUp() override;
   void TearDown() override;