Add most missing blink files to .gn files

third_party/WebKit/Source/core/animation/BUILD.gn

Index: third_party/WebKit/Source/core/animation/BUILD.gn
diff --git a/third_party/WebKit/Source/core/animation/BUILD.gn b/third_party/WebKit/Source/core/animation/BUILD.gn
index adb1cc29ca63d8e48291d2aacb1720af41a94d23..2decca8ebdc50f3e549365e975f23e8c7040f811 100644
--- a/third_party/WebKit/Source/core/animation/BUILD.gn
+++ b/third_party/WebKit/Source/core/animation/BUILD.gn
@@ -24,6 +24,7 @@ blink_core_sources("animation") {
     "AnimationTimeline.h",
     "BasicShapeInterpolationFunctions.cpp",
     "BasicShapeInterpolationFunctions.h",
+    "BasicShapePropertyFunctions.h",
     "BorderImageLengthBoxPropertyFunctions.h",
     "CSSAngleInterpolationType.cpp",
     "CSSAngleInterpolationType.h",
@@ -120,6 +121,7 @@ blink_core_sources("animation") {
     "InertEffect.h",
     "InterpolableValue.cpp",
     "InterpolableValue.h",
+    "InterpolatedSVGPathSource.h",
     "Interpolation.h",
     "InterpolationEffect.cpp",
     "InterpolationEffect.h",
@@ -196,6 +198,7 @@ blink_core_sources("animation") {
     "SampledEffect.h",
     "ShadowInterpolationFunctions.cpp",
     "ShadowInterpolationFunctions.h",
+    "ShadowListPropertyFunctions.h",
     "SizeInterpolationFunctions.cpp",
     "SizeInterpolationFunctions.h",
     "SizeListPropertyFunctions.cpp",
@@ -212,6 +215,7 @@ blink_core_sources("animation") {
     "TransitionKeyframe.cpp",
     "TransitionKeyframe.h",
     "TypedInterpolationValue.h",
+    "UnderlyingLengthChecker.h",
     "UnderlyingValueOwner.cpp",
     "UnderlyingValueOwner.h",
     "animatable/AnimatableClipPathOperation.cpp",