Web Animations: Extract an API for servicing animations

Source/testing/runner/WebTestProxy.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 738 matching lines @@
         m_animateScheduled = true;
         m_delegate->postDelayedTask(new HostMethodTask(this, &WebTestProxyBase::animateNow), 1);
     }
 }
 
 void WebTestProxyBase::animateNow()
 {
     if (m_animateScheduled) {
         m_animateScheduled = false;
         webWidget()->animate(0.0);
+        webWidget()->layout();
     }
 }
 
 void WebTestProxyBase::show(WebNavigationPolicy)
 {
     invalidateAll();
 }
 
 void WebTestProxyBase::setWindowRect(const WebRect& rect)
 {
@@ skipping 603 matching lines @@
 
 void WebTestProxyBase::resetInputMethod()
 {
     // If a composition text exists, then we need to let the browser process
     // to cancel the input method's ongoing composition session.
     if (m_webWidget)
         m_webWidget->confirmComposition();
 }
 
 }