Animation: Implement DoubleStyleInterpolation in StringKeyframe

Source/core/animation/LengthStyleInterpolation.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/animation/LengthStyleInterpolation.h"
 
 #include "core/css/CSSCalculationValue.h"
 #include "core/css/resolver/StyleBuilder.h"
 
 namespace blink {
 
 bool LengthStyleInterpolation::canCreateFrom(const CSSValue& value)
 {
     if (value.isPrimitiveValue()) {
         const CSSPrimitiveValue& primitiveValue = blink::toCSSPrimitiveValue(value);
         if (primitiveValue.cssCalcValue())
             return true;
 
         CSSPrimitiveValue::LengthUnitType type;
         // Only returns true if the type is a primitive length unit.
         return CSSPrimitiveValue::unitTypeToLengthUnitType(primitiveValue.primitiveType(), type);
     }
     return value.isCalcValue();
 }
 
 PassOwnPtrWillBeRawPtr<InterpolableValue> LengthStyleInterpolation::lengthToInterpolableValue(const CSSValue& value)
 {
+    ASSERT(canCreateFrom(value));
     OwnPtrWillBeRawPtr<InterpolableList> listOfValuesAndTypes = InterpolableList::create(2);
     OwnPtrWillBeRawPtr<InterpolableList> listOfValues = InterpolableList::create(CSSPrimitiveValue::LengthUnitTypeCount);
     OwnPtrWillBeRawPtr<InterpolableList> listOfTypes = InterpolableList::create(CSSPrimitiveValue::LengthUnitTypeCount);
 
     const CSSPrimitiveValue& primitive = toCSSPrimitiveValue(value);
 
     CSSLengthArray arrayOfValues;
     CSSPrimitiveValue::CSSLengthTypeArray arrayOfTypes;
     for (size_t i = 0; i < CSSPrimitiveValue::LengthUnitTypeCount; i++)
         arrayOfValues.append(0);
@@ skipping 77 matching lines @@
 {
     StyleBuilder::applyProperty(m_id, state, interpolableValueToLength(m_cachedValue.get(), m_range).get());
 }
 
 void LengthStyleInterpolation::trace(Visitor* visitor)
 {
     StyleInterpolation::trace(visitor);
 }
 
 }