[MacViews] Implement AlwaysOnTop and VisibleOnAllWorkspaces.

ui/views/widget/widget_unittest.cc

Index: ui/views/widget/widget_unittest.cc
diff --git a/ui/views/widget/widget_unittest.cc b/ui/views/widget/widget_unittest.cc
index b564366fd0672cfa209ba25c840b3d917a7653dc..28810988f559d5bc4fc2cfe5a933e59a6559724a 100644
--- a/ui/views/widget/widget_unittest.cc
+++ b/ui/views/widget/widget_unittest.cc
@@ -3433,5 +3433,15 @@ TEST_F(WidgetTest, CharMessagesAsKeyboardMessagesDoesNotCrash) {
 }
 #endif
 
+// Test that SetAlwaysOnTop and IsAlwaysOnTop are consistent.
+TEST_F(WidgetTest, AlwaysOnTop) {
+  Widget* widget = CreateTopLevelNativeWidget();
+  EXPECT_FALSE(widget->IsAlwaysOnTop());
+  widget->SetAlwaysOnTop(true);
+  EXPECT_TRUE(widget->IsAlwaysOnTop());
+  widget->SetAlwaysOnTop(false);
+  EXPECT_FALSE(widget->IsAlwaysOnTop());
+}
+
 }  // namespace test
 }  // namespace views