Correctly apply per-keyframe timing functions

Source/core/rendering/style/KeyframeList.cpp

 /*
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 24 matching lines @@
     unsigned propertyCount = propertySet->propertyCount();
     for (unsigned i = 0; i < propertyCount; ++i) {
         CSSPropertyID property = propertySet->propertyAt(i).id();
         // Timing-function within keyframes is special, because it is not animated; it just
         // describes the timing function between this keyframe and the next.
         if (property != CSSPropertyWebkitAnimationTimingFunction && property != CSSPropertyAnimationTimingFunction)
             addProperty(property);
     }
 }
 
-TimingFunction* KeyframeValue::timingFunction(const RenderStyle* keyframeStyle, const AtomicString& name)
+TimingFunction* KeyframeValue::timingFunction(const RenderStyle& keyframeStyle)
 {
-    ASSERT(keyframeStyle && keyframeStyle->animations());
-    for (size_t i = 0; i < keyframeStyle->animations()->size(); i++) {
-        if (name == keyframeStyle->animations()->animation(i)->name())
-            return keyframeStyle->animations()->animation(i)->timingFunction();
-    }
-    ASSERT_NOT_REACHED();
-    return 0;
+    const CSSAnimationDataList* animations = keyframeStyle.animations();
+    ASSERT(animations && !animations->isEmpty());
+    return animations->animation(0)->timingFunction();
 }
 
 KeyframeList::~KeyframeList()
 {
     clear();
 }
 
 void KeyframeList::clear()
 {
     m_keyframes.clear();
@@ skipping 33 matching lines @@
             for (HashSet<CSSPropertyID>::const_iterator it = currKeyframe.properties().begin(); it != currKeyframe.properties().end(); ++it)
                 m_properties.add(*it);
         }
     } else {
         for (HashSet<CSSPropertyID>::const_iterator it = keyframe.properties().begin(); it != keyframe.properties().end(); ++it)
             m_properties.add(*it);
     }
 }
 
 } // namespace WebCore