MacViews: Put wm window animation calls behind an interface.

ui/views/widget/widget.h

Index: ui/views/widget/widget.h
diff --git a/ui/views/widget/widget.h b/ui/views/widget/widget.h
index 4fb573a9a13dc55b341de435359e3eeba5252838..fa7c771746fc067887a022c8eabd3c268d6264a8 100644
--- a/ui/views/widget/widget.h
+++ b/ui/views/widget/widget.h
@@ -37,6 +37,10 @@
 #endif
 #endif
 
+namespace base {
+class TimeDelta;
+}
+
 namespace gfx {
 class Canvas;
 class Point;
@@ -133,6 +137,14 @@ class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
     MOVE_LOOP_ESCAPE_BEHAVIOR_DONT_HIDE,
   };
 
+  // Type of visibility change transition that should animate.
+  enum VisibilityTransition {
+    ANIMATE_SHOW = 0x1,
+    ANIMATE_HIDE = 0x2,
+    ANIMATE_BOTH = ANIMATE_SHOW | ANIMATE_HIDE,
+    ANIMATE_NONE = 0x4,
+  };
+
   struct VIEWS_EXPORT InitParams {
     enum Type {
       TYPE_WINDOW,      // A decorated Window, like a frame window.
@@ -420,6 +432,13 @@ class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
   // Default is true.
   void SetVisibilityChangedAnimationsEnabled(bool value);
 
+  // Sets the duration of visibility change animations.
+  void SetVisibilityAnimationDuration(const base::TimeDelta& duration);
+
+  // Sets the visibility transitions that should animate.
+  // Default behavior is to animate both show and hide.
+  void SetVisibilityAnimationTransition(VisibilityTransition transition);
+
   // Starts a nested message loop that moves the window. This can be used to
   // start a window move operation from a mouse or touch event. This returns
   // when the move completes. |drag_offset| is the offset from the top left