Web Animations CSS: Split AnimatableNumber into AnimatableDouble and AnimatableLength

Source/core/core.gypi

Index: Source/core/core.gypi
diff --git a/Source/core/core.gypi b/Source/core/core.gypi
index 3bd423c039428930dd39665d37c3c3f1290347fa..2b58e9c0f5d264a9a0882683c721bcbbe988827f 100644
--- a/Source/core/core.gypi
+++ b/Source/core/core.gypi
@@ -527,15 +527,17 @@
             'animation/AnimatableClipPathOperation.h',
             'animation/AnimatableColor.cpp',
             'animation/AnimatableColor.h',
+            'animation/AnimatableDouble.cpp',
+            'animation/AnimatableDouble.h',
             'animation/AnimatableImage.cpp',
             'animation/AnimatableImage.h',
+            'animation/AnimatableLength.cpp',
+            'animation/AnimatableLength.h',
             'animation/AnimatableLengthBox.cpp',
             'animation/AnimatableLengthBox.h',
             'animation/AnimatableLengthSize.cpp',
             'animation/AnimatableLengthSize.h',
             'animation/AnimatableNeutral.h',
-            'animation/AnimatableNumber.cpp',
-            'animation/AnimatableNumber.h',
             'animation/AnimatableShapeValue.cpp',
             'animation/AnimatableShapeValue.h',
             'animation/AnimatableTransform.cpp',
@@ -3768,8 +3770,9 @@
         ],
         'core_unittest_files': [
             'animation/AnimatableColorTest.cpp',
+            'animation/AnimatableDoubleTest.cpp',
+            'animation/AnimatableLengthTest.cpp',
             'animation/AnimatableNeutralTest.cpp',
-            'animation/AnimatableNumberTest.cpp',
             'animation/AnimatableUnknownTest.cpp',
             'animation/DocumentTimelineTest.cpp',
             'animation/KeyframeAnimationEffectTest.cpp',