Update animation when changes in animation keyframes are detected.

Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/Animation.idl',
             'animation/AnimationEffect.idl',
             'animation/AnimationNode.idl',
@@ skipping 803 matching lines @@
             'css/FontFaceSet.cpp',
             'css/FontFaceSet.h',
             'css/FontFaceSetForEachCallback.h',
             'css/FontFaceSetLoadEvent.cpp',
             'css/FontFaceSetLoadEvent.h',
             'css/FontLoader.cpp',
             'css/FontLoader.h',
             'css/FontSize.cpp',
             'css/FontSize.h',
             'css/HashTools.h',
+            'css/KeyframeStyleRuleCSSStyleDeclaration.cpp',
+            'css/KeyframeStyleRuleCSSStyleDeclaration.h',
             'css/LocalFontFaceSource.cpp',
             'css/LocalFontFaceSource.h',
             'css/MediaList.cpp',
             'css/MediaList.h',
             'css/MediaQuery.cpp',
             'css/MediaQuery.h',
             'css/MediaQueryEvaluator.cpp',
             'css/MediaQueryEvaluator.h',
             'css/MediaQueryExp.cpp',
             'css/MediaQueryExp.h',
@@ skipping 2925 matching lines @@
             'rendering/style/RenderStyleTest.cpp',
             'rendering/style/SVGRenderStyleTest.cpp',
             'streams/ReadableStreamTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }