views/mus: Run some more tests from views_unittests in mus.

ui/views/view_unittest.cc

Index: ui/views/view_unittest.cc
diff --git a/ui/views/view_unittest.cc b/ui/views/view_unittest.cc
index 89e3c1bb94db3192ab7ad385b757aefc7e79e4f2..3fcdf9e1e4bf220c76699cb0bcd5859b19405915 100644
--- a/ui/views/view_unittest.cc
+++ b/ui/views/view_unittest.cc
@@ -4045,6 +4045,9 @@ class PaintTrackingView : public View {
 // Makes sure child views with layers aren't painted when paint starts at an
 // ancestor.
 TEST_F(ViewLayerTest, DontPaintChildrenWithLayers) {
+  // TODO(sad): DrawWaiterForTest does not work with mus. crbug.com/618136
+  if (IsMus())
+    return;
   PaintTrackingView* content_view = new PaintTrackingView;
   widget()->SetContentsView(content_view);
   content_view->SetPaintToLayer(true);