CPAnimationContext: Inhibit DOM updates during size animation

Previously, during frame updates, we were writing the css values we
just read before.
Canvas sizing is preserved as it is needed when the view has custom
drawing.

AppKit/CPView.j

@@ -1278,7 +1278,8 @@ var CPViewHighDPIDrawingEnabled = YES;
 #if PLATFORM(DOM)
     var scale = [self scaleSize];
 
-    CPDOMDisplayServerSetStyleSize(_DOMElement, aSize.width * 1 / scale.width, aSize.height * 1 / scale.height);
+    if (!_inhibitDOMUpdates)
+        CPDOMDisplayServerSetStyleSize(_DOMElement, aSize.width * 1 / scale.width, aSize.height * 1 / scale.height);
 
     if (_DOMContentsElement)
     {