Add foundation for removing AnimatableValues from StyleInterpolation

Source/core/core.gypi

Index: Source/core/core.gypi
diff --git a/Source/core/core.gypi b/Source/core/core.gypi
index b5817efb05fa2a8488c8a70bc9a20cacf54c6ced..f33a93212ad258e4c2b130e5be16381f46332cff 100644
--- a/Source/core/core.gypi
+++ b/Source/core/core.gypi
@@ -878,6 +878,10 @@
             'animation/AnimationTimeline.h',
             'animation/AnimationTranslationUtil.cpp',
             'animation/AnimationTranslationUtil.h',
+            'animation/AnimationType.h',
+            'animation/AnimationValue.h',
+            'animation/CSSValueAnimationType.cpp',
+            'animation/CSSValueAnimationType.h',
             'animation/CompositorAnimations.cpp',
             'animation/CompositorAnimations.h',
             'animation/CompositorAnimationsImpl.h',
@@ -917,6 +921,8 @@
             'animation/Interpolation.h',
             'animation/InterpolationEffect.cpp',
             'animation/InterpolationEffect.h',
+            'animation/InvalidatableStyleInterpolation.cpp',
+            'animation/InvalidatableStyleInterpolation.h',
             'animation/KeyframeEffectModel.cpp',
             'animation/KeyframeEffectModel.h',
             'animation/LegacyStyleInterpolation.h',
@@ -928,9 +934,11 @@
             'animation/LengthSVGInterpolation.h',
             'animation/LengthStyleInterpolation.cpp',
             'animation/LengthStyleInterpolation.h',
+            'animation/NonInterpolableValue.h',
             'animation/NumberOptionalNumberSVGInterpolation.h',
             'animation/NumberSVGInterpolation.cpp',
             'animation/NumberSVGInterpolation.h',
+            'animation/PrimitiveInterpolation.h',
             'animation/PropertyHandle.cpp',
             'animation/PropertyHandle.h',
             'animation/RectSVGInterpolation.cpp',