Add TransitionInterpolation class for CSS Transition refactor

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

 # Copyright 2016 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.
 
 import("//third_party/WebKit/Source/core/core.gni")
 
 blink_core_sources("animation") {
   split_count = 5
 
   sources = [
@@ skipping 101 matching lines @@
     "ImageListPropertyFunctions.h",
     "ImagePropertyFunctions.h",
     "ImageSlicePropertyFunctions.h",
     "InertEffect.cpp",
     "InertEffect.h",
     "InterpolableValue.cpp",
     "InterpolableValue.h",
     "Interpolation.h",
     "InterpolationEffect.cpp",
     "InterpolationEffect.h",
+    "InterpolationEnvironment.h",
     "InterpolationType.h",
     "InterpolationTypesMap.h",
     "InterpolationValue.h",
     "InvalidatableInterpolation.cpp",
     "InvalidatableInterpolation.h",
     "Keyframe.cpp",
     "Keyframe.h",
     "KeyframeEffect.cpp",
     "KeyframeEffect.h",
     "KeyframeEffectModel.cpp",
@@ skipping 63 matching lines @@
     "SizeInterpolationFunctions.h",
     "SizeListPropertyFunctions.cpp",
     "SizeListPropertyFunctions.h",
     "StringKeyframe.cpp",
     "StringKeyframe.h",
     "Timing.cpp",
     "Timing.h",
     "TimingCalculations.h",
     "TimingInput.cpp",
     "TimingInput.h",
+    "TransitionInterpolation.cpp",
+    "TransitionInterpolation.h",
     "TypedInterpolationValue.h",
     "UnderlyingValueOwner.cpp",
     "UnderlyingValueOwner.h",
     "animatable/AnimatableClipPathOperation.cpp",
     "animatable/AnimatableClipPathOperation.h",
     "animatable/AnimatableColor.cpp",
     "animatable/AnimatableColor.h",
     "animatable/AnimatableDouble.cpp",
     "animatable/AnimatableDouble.h",
     "animatable/AnimatableDoubleAndBool.cpp",
@@ skipping 47 matching lines @@
     "css/CSSTimingData.h",
     "css/CSSTransitionData.cpp",
     "css/CSSTransitionData.h",
   ]
 
   configs += [
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     "//build/config/compiler:no_size_t_to_int_warning",
   ]
 }