Sibling invalidation sets

Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/KeyframeEffect.idl',
             'animation/EffectModel.idl',
             'animation/AnimationEffectReadOnly.idl',
@@ skipping 1186 matching lines @@
             'css/StyleRuleKeyframe.h',
             'css/StyleRuleNamespace.h',
             'css/StyleSheet.cpp',
             'css/StyleSheet.h',
             'css/StyleSheetContents.cpp',
             'css/StyleSheetContents.h',
             'css/StyleSheetList.cpp',
             'css/StyleSheetList.h',
             'css/invalidation/DescendantInvalidationSet.cpp',
             'css/invalidation/DescendantInvalidationSet.h',
+            'css/invalidation/InvalidationData.cpp',
+            'css/invalidation/InvalidationData.h',
             'css/invalidation/StyleInvalidator.cpp',
             'css/invalidation/StyleInvalidator.h',
             'css/invalidation/StyleSheetInvalidationAnalysis.cpp',
             'css/invalidation/StyleSheetInvalidationAnalysis.h',
             'css/parser/CSSParser.cpp',
             'css/parser/CSSParser.h',
             'css/parser/CSSParserFastPaths.cpp',
             'css/parser/CSSParserFastPaths.h',
             'css/parser/CSSParserImpl.cpp',
             'css/parser/CSSParserImpl.h',
@@ skipping 2518 matching lines @@
             'css/CSSSelectorTest.cpp',
             'css/CSSTestHelper.cpp',
             'css/CSSTestHelper.h',
             'css/CSSValueTestHelper.h',
             'css/DragUpdateTest.cpp',
             'css/MediaQueryEvaluatorTest.cpp',
             'css/MediaQueryListTest.cpp',
             'css/MediaQueryMatcherTest.cpp',
             'css/MediaQuerySetTest.cpp',
             'css/MediaValuesTest.cpp',
+            'css/RuleFeatureSetTest.cpp',
             'css/RuleSetTest.cpp',
             'css/invalidation/DescendantInvalidationSetTest.cpp',
             'css/parser/CSSParserValuesTest.cpp',
             'css/parser/CSSPropertyParserTest.cpp',
             'css/parser/CSSSelectorParserTest.cpp',
             'css/parser/CSSTokenizerTest.cpp',
             'css/parser/MediaConditionTest.cpp',
             'css/parser/SizesAttributeParserTest.cpp',
             'css/parser/SizesCalcParserTest.cpp',
             'css/resolver/FontBuilderTest.cpp',
@@ skipping 102 matching lines @@
             'style/OutlineValueTest.cpp',
             'style/SVGComputedStyleTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }