Oilpan: fix build after r194000.

Source/core/animation/StringKeyframe.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/StringKeyframe.h"
 
 #include "core/animation/AngleSVGInterpolation.h"
 #include "core/animation/ColorStyleInterpolation.h"
 #include "core/animation/CompositorAnimations.h"
@@ skipping 454 matching lines @@
 
 PassOwnPtrWillBeRawPtr<Keyframe::PropertySpecificKeyframe> SVGPropertySpecificKeyframe::neutralKeyframe(double offset, PassRefPtr<TimingFunction> easing) const
 {
     return adoptPtrWillBeNoop(new SVGPropertySpecificKeyframe(offset, easing, "", AnimationEffect::CompositeAdd));
 }
 
 namespace {
 
 PassRefPtrWillBeRawPtr<Interpolation> createSVGInterpolation(SVGPropertyBase* fromValue, SVGPropertyBase* toValue, SVGAnimatedPropertyBase* attribute)
 {
-    RefPtrWillBeRawPtr<Interpolation> interpolation;
+    RefPtrWillBeRawPtr<Interpolation> interpolation = nullptr;
     ASSERT(fromValue->type() == toValue->type());
     switch (fromValue->type()) {
     case AnimatedAngle:
         if (AngleSVGInterpolation::canCreateFrom(fromValue) && AngleSVGInterpolation::canCreateFrom(toValue))
             return AngleSVGInterpolation::create(fromValue, toValue, attribute);
         break;
     case AnimatedPoints:
         interpolation = ListSVGInterpolation<PointSVGInterpolation>::maybeCreate(fromValue, toValue, attribute);
         break;
 
@@ skipping 18 matching lines @@
     RefPtrWillBeRawPtr<SVGPropertyBase> fromValue = attribute->currentValueBase()->cloneForAnimation(m_value);
     RefPtrWillBeRawPtr<SVGPropertyBase> toValue = attribute->currentValueBase()->cloneForAnimation(toSVGPropertySpecificKeyframe(end).value());
 
     if (!fromValue || !toValue)
         return nullptr;
 
     return createSVGInterpolation(fromValue.get(), toValue.get(), attribute.get());
 }
 
 }