Web Animations: Refactor KeyframeEffectModel to work via an InterpolationEffect.

Source/core/animation/Interpolation.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/Interpolation.h"
 
+#include "core/css/resolver/AnimatedStyleBuilder.h"
+#include "core/css/resolver/StyleResolverState.h"
+
 namespace WebCore {
 
 namespace {
 
 bool typesMatch(const InterpolableValue* start, const InterpolableValue* end)
 {
     if (start->isNumber())
         return end->isNumber();
     if (start->isBool())
         return end->isBool();
+    if (start->isAnimatableValue())
+        return end->isAnimatableValue();
     if (!(start->isList() && end->isList()))
         return false;
     const InterpolableList* startList = toInterpolableList(start);
     const InterpolableList* endList = toInterpolableList(end);
     if (startList->length() != endList->length())
         return false;
     for (size_t i = 0; i < startList->length(); ++i) {
         if (!typesMatch(startList->get(i), endList->get(i)))
             return false;
     }
@@ skipping 14 matching lines @@
 
 void Interpolation::interpolate(int iteration, double fraction) const
 {
     if (m_cachedFraction != fraction || m_cachedIteration != iteration) {
         m_cachedValue = m_start->interpolate(*m_end, fraction);
         m_cachedIteration = iteration;
         m_cachedFraction = fraction;
     }
 }
 
+void LegacyStyleInterpolation::apply(StyleResolverState& state) const
+{
+    AnimatableValue* value = currentValue();
+    AnimatedStyleBuilder::applyProperty(m_id, state, value);
 }
+
+}