| Index: third_party/WebKit/Source/core/animation/PropertyInterpolationTypesMapping.cpp
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| diff --git a/third_party/WebKit/Source/core/animation/PropertyInterpolationTypesMapping.cpp b/third_party/WebKit/Source/core/animation/PropertyInterpolationTypesMapping.cpp
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| index 52bee75065219cb2b52f235bd88681a31de20f11..1f2a93c541d2a1f86839991759317ee4af9d5121 100644
 | 
| --- a/third_party/WebKit/Source/core/animation/PropertyInterpolationTypesMapping.cpp
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| +++ b/third_party/WebKit/Source/core/animation/PropertyInterpolationTypesMapping.cpp
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| @@ -16,6 +16,7 @@
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|  #include "core/animation/CSSNumberInterpolationType.h"
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|  #include "core/animation/CSSPaintInterpolationType.h"
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|  #include "core/animation/CSSPathInterpolationType.h"
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| +#include "core/animation/CSSPositionAxisListInterpolationType.h"
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|  #include "core/animation/CSSShadowListInterpolationType.h"
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|  #include "core/animation/CSSValueInterpolationType.h"
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|  #include "core/animation/CSSVisibilityInterpolationType.h"
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| @@ -174,6 +175,12 @@ const InterpolationTypes* PropertyInterpolationTypesMapping::get(const PropertyH
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|          case CSSPropertyMotionRotation:
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|              applicableTypes->append(adoptPtr(new CSSMotionRotationInterpolationType(cssProperty)));
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|              break;
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| +        case CSSPropertyBackgroundPositionX:
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| +        case CSSPropertyBackgroundPositionY:
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| +        case CSSPropertyWebkitMaskPositionX:
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| +        case CSSPropertyWebkitMaskPositionY:
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| +            applicableTypes->append(adoptPtr(new CSSPositionAxisListInterpolationType(cssProperty)));
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| +            break;
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|          default:
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|              // TODO(alancutter): Support all interpolable CSS properties here so we can stop falling back to the old StyleInterpolation implementation.
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|              if (CSSPropertyMetadata::isInterpolableProperty(cssProperty))
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| 
 |