Simplify animation/transition parsing slightly

Source/core/css/resolver/CSSToStyleMap.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 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 378 matching lines @@
     if (primitiveValue->getValueID() == CSSValueNone)
         return CSSTransitionData::TransitionProperty(CSSTransitionData::TransitionNone);
     return CSSTransitionData::TransitionProperty(primitiveValue->getPropertyID());
 }
 
 PassRefPtr<TimingFunction> CSSToStyleMap::mapAnimationTimingFunction(CSSValue* value, bool allowStepMiddle)
 {
     // FIXME: We should probably only call into this function with a valid
     // single timing function value which isn't initial or inherit. We can
     // currently get into here with initial since the parser expands unset
-    // properties in shorthands to initial and we can get into here with a
-    // value list via the EffectInput/TimingInput code paths.
+    // properties in shorthands to initial.
 
     if (value->isPrimitiveValue()) {
         CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
         switch (primitiveValue->getValueID()) {
         case CSSValueLinear:
             return LinearTimingFunction::shared();
         case CSSValueEase:
             return CubicBezierTimingFunction::preset(CubicBezierTimingFunction::Ease);
         case CSSValueEaseIn:
             return CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
@@ skipping 13 matching lines @@
             ASSERT_NOT_REACHED();
             return CSSTimingData::initialTimingFunction();
         }
     }
 
     if (value->isCubicBezierTimingFunctionValue()) {
         CSSCubicBezierTimingFunctionValue* cubicTimingFunction = toCSSCubicBezierTimingFunctionValue(value);
         return CubicBezierTimingFunction::create(cubicTimingFunction->x1(), cubicTimingFunction->y1(), cubicTimingFunction->x2(), cubicTimingFunction->y2());
     }
 
-    if (!value->isStepsTimingFunctionValue())
+    if (value->isInitialValue())
         return CSSTimingData::initialTimingFunction();
 
     CSSStepsTimingFunctionValue* stepsTimingFunction = toCSSStepsTimingFunctionValue(value);
     if (stepsTimingFunction->stepAtPosition() == StepsTimingFunction::StepAtMiddle && !allowStepMiddle)
         return CSSTimingData::initialTimingFunction();
     return StepsTimingFunction::create(stepsTimingFunction->numberOfSteps(), stepsTimingFunction->stepAtPosition());
 }
 
 void CSSToStyleMap::mapNinePieceImage(RenderStyle* mutableStyle, CSSPropertyID property, CSSValue* value, NinePieceImage& image)
 {
@@ skipping 157 matching lines @@
         verticalRule = SpaceImageRule;
         break;
     default: // CSSValueRepeat
         verticalRule = RepeatImageRule;
         break;
     }
     image.setVerticalRule(verticalRule);
 }
 
 };