MacViews: Put wm window animation calls behind an interface.

ui/views/widget/native_widget_mac.mm

Index: ui/views/widget/native_widget_mac.mm
diff --git a/ui/views/widget/native_widget_mac.mm b/ui/views/widget/native_widget_mac.mm
index b6578bc1ce63ed3f0f664c775890b4eee09955ec..3e0dca963f4fafd5fb9ac3b6d9589134edcdcb0a 100644
--- a/ui/views/widget/native_widget_mac.mm
+++ b/ui/views/widget/native_widget_mac.mm
@@ -512,6 +512,16 @@ void NativeWidgetMac::SetVisibilityChangedAnimationsEnabled(bool value) {
   NOTIMPLEMENTED();
 }
 
+void NativeWidgetMac::SetVisibilityAnimationDuration(
+    const base::TimeDelta& duration) {
+  NOTIMPLEMENTED();
+}
+
+void NativeWidgetMac::SetVisibilityAnimationTransition(
+    Widget::VisibilityTransition transition) {
+  NOTIMPLEMENTED();
+}
+
 ui::NativeTheme* NativeWidgetMac::GetNativeTheme() const {
   return ui::NativeTheme::instance();
 }