Make CSSAnimationUpdate stack-allocated

Source/core/css/resolver/StyleResolver.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 77 matching lines @@
 #include "wtf/StdLibExtras.h"
 
 namespace {
 
 using namespace blink;
 
 void setAnimationUpdateIfNeeded(StyleResolverState& state, Element& element)
 {
     // If any changes to CSS Animations were detected, stash the update away for application after the
     // layout object is updated if we're in the appropriate scope.
-    if (state.animationUpdate())
-        element.ensureElementAnimations().cssAnimations().setPendingUpdate(state.takeAnimationUpdate());
+    if (!state.animationUpdate().isEmpty())
+        element.ensureElementAnimations().cssAnimations().setPendingUpdate(state.animationUpdate());
 }
 
 } // namespace
 
 namespace blink {
 
 using namespace HTMLNames;
 
 ComputedStyle* StyleResolver::s_styleNotYetAvailable;
 
@@ skipping 809 matching lines @@
 
     // The animating element may be this element, or its pseudo element. It is
     // null when calculating the style for a potential pseudo element that has
     // yet to be created.
     ASSERT(animatingElement == element || !animatingElement || animatingElement->parentOrShadowHostElement() == element);
 
     if (!(animatingElement && animatingElement->hasAnimations())
         && !state.style()->transitions() && !state.style()->animations())
         return false;
 
-    state.setAnimationUpdate(CSSAnimations::calculateUpdate(animatingElement, *element, *state.style(), state.parentStyle(), this));
-    if (!state.animationUpdate())
+    CSSAnimations::calculateUpdate(animatingElement, *element, *state.style(), state.parentStyle(), state.animationUpdate(), this);
+    if (state.animationUpdate().isEmpty())
         return false;
 
-    const ActiveInterpolationMap& activeInterpolationsForAnimations = state.animationUpdate()->activeInterpolationsForAnimations();
-    const ActiveInterpolationMap& activeInterpolationsForTransitions = state.animationUpdate()->activeInterpolationsForTransitions();
+    const ActiveInterpolationMap& activeInterpolationsForAnimations = state.animationUpdate().activeInterpolationsForAnimations();
+    const ActiveInterpolationMap& activeInterpolationsForTransitions = state.animationUpdate().activeInterpolationsForTransitions();
     applyAnimatedProperties<HighPropertyPriority>(state, activeInterpolationsForAnimations);
     applyAnimatedProperties<HighPropertyPriority>(state, activeInterpolationsForTransitions);
 
     updateFont(state);
 
     applyAnimatedProperties<LowPropertyPriority>(state, activeInterpolationsForAnimations);
     applyAnimatedProperties<LowPropertyPriority>(state, activeInterpolationsForTransitions);
 
     // Start loading resources used by animations.
     loadPendingResources(state);
@@ skipping 502 matching lines @@
     visitor->trace(m_watchedSelectorsRules);
     visitor->trace(m_treeBoundaryCrossingRules);
     visitor->trace(m_styleResourceLoader);
     visitor->trace(m_styleSharingLists);
     visitor->trace(m_pendingStyleSheets);
     visitor->trace(m_document);
 #endif
 }
 
 } // namespace blink