Introduce KeyframeEffectReadOnly interface

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 108 matching lines @@
     "InterpolationType.h",
     "InterpolationValue.h",
     "InvalidatableInterpolation.cpp",
     "InvalidatableInterpolation.h",
     "Keyframe.cpp",
     "Keyframe.h",
     "KeyframeEffect.cpp",
     "KeyframeEffect.h",
     "KeyframeEffectModel.cpp",
     "KeyframeEffectModel.h",
+    "KeyframeEffectReadOnly.cpp",
+    "KeyframeEffectReadOnly.h",
     "LegacyStyleInterpolation.h",
     "LengthInterpolationFunctions.cpp",
     "LengthInterpolationFunctions.h",
     "LengthListPropertyFunctions.cpp",
     "LengthListPropertyFunctions.h",
     "LengthPropertyFunctions.cpp",
     "LengthPropertyFunctions.h",
     "LengthUnitsChecker.h",
     "ListInterpolationFunctions.cpp",
     "ListInterpolationFunctions.h",
@@ skipping 117 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",
   ]
 }