Move CSSAnimationData and CSSAnimationDataList to platform/

Source/platform/blink_platform.gypi

 {
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.cpp',
       'CalculationValue.h',
       'CheckedInt.h',
       'Clock.cpp',
       'Clock.h',
       'ColorChooser.cpp',
@@ skipping 104 matching lines @@
       'UserGestureIndicator.cpp',
       'UserGestureIndicator.h',
       'URLPatternMatcher.cpp',
       'URLPatternMatcher.h',
       'UUID.cpp',
       'UUID.h',
       'Widget.cpp',
       'Widget.h',
       'WindowsKeyboardCodes.h',
       'animation/AnimationUtilities.h',
+      'animation/CSSAnimationData.cpp',
+      'animation/CSSAnimationData.h',
+      'animation/CSSAnimationDataList.cpp',
+      'animation/CSSAnimationDataList.h',
       'animation/UnitBezier.h',
       'audio/AudioArray.h',
       'audio/AudioBus.cpp',
       'audio/AudioBus.h',
       'audio/AudioChannel.cpp',
       'audio/AudioChannel.h',
       'audio/AudioDSPKernel.cpp',
       'audio/AudioDSPKernel.h',
       'audio/AudioDSPKernelProcessor.cpp',
       'audio/AudioDSPKernelProcessor.h',
@@ skipping 366 matching lines @@
       'geometry/RoundedRectTest.cpp',
       'graphics/ThreadSafeDataTransportTest.cpp',
       'testing/ArenaTestHelpers.h',
       'testing/TreeTestHelpers.cpp',
       'testing/TreeTestHelpers.h',
       'text/BidiResolverTest.cpp',
       'text/DateTimeFormatTest.cpp',
     ],
   },
 }