Web Animations CSS: Start running animations on the compositor

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1420 matching lines @@
         data->setPseudoElement(BACKDROP, 0);
         data->setIsInsideRegion(false);
 
         // attach() will perform the below steps for us when inside recalcStyle.
         if (!document().inStyleRecalc()) {
             data->resetStyleState();
             data->clearComputedStyle();
             data->resetDynamicRestyleObservations();
         }
 
-        if (RuntimeEnabledFeatures::webAnimationsCSSEnabled() && !context.performingReattach) {
-            if (ActiveAnimations* activeAnimations = data->activeAnimations())
-                activeAnimations->cssAnimations().cancel();
+        if (RuntimeEnabledFeatures::webAnimationsCSSEnabled()) {
+            if (ActiveAnimations* activeAnimations = data->activeAnimations()) {
+                if (context.performingReattach) {
+                    // FIXME: restart compositor animations rather than pull back to the main thread
+                    activeAnimations->cancelCompositorAnimations();
+                } else {
+                    activeAnimations->cssAnimations().cancel();
+                }
+            }
         }
     }
     if (ElementShadow* shadow = this->shadow())
         shadow->detach(context);
     ContainerNode::detach(context);
 }
 
 bool Element::pseudoStyleCacheIsInvalid(const RenderStyle* currentStyle, RenderStyle* newStyle)
 {
     ASSERT(currentStyle == renderStyle());
@@ skipping 2062 matching lines @@
     // Before doing so, we need to resolve issues in HTMLSelectElement::recalcListItems
     // and RenderMenuList::setText. See also https://bugs.webkit.org/show_bug.cgi?id=88405
     if (hasTagName(optionTag) || hasTagName(optgroupTag))
         return false;
     if (FullscreenElementStack::isActiveFullScreenElement(this))
         return false;
     return true;
 }
 
 } // namespace WebCore