[Typed-OM] Add compound type of CSSVariableReferenceValue and String with some tests

third_party/WebKit/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 38 matching lines @@
             'css/cssom/CSSPositionValue.idl',
             'css/cssom/CSSRotation.idl',
             'css/cssom/CSSScale.idl',
             'css/cssom/CSSSimpleLength.idl',
             'css/cssom/CSSSkew.idl',
             'css/cssom/CSSStyleValue.idl',
             'css/cssom/CSSTokenStreamValue.idl',
             'css/cssom/CSSTransformComponent.idl',
             'css/cssom/CSSTransformValue.idl',
             'css/cssom/CSSTranslation.idl',
+            'css/cssom/CSSVariableReferenceValue.idl',
             'css/cssom/StylePropertyMap.idl',
             'dom/ArrayBuffer.idl',
             'dom/ArrayBufferView.idl',
             'dom/Attr.idl',
             'dom/CDATASection.idl',
             'dom/CharacterData.idl',
             'dom/ClientRect.idl',
             'dom/ClientRectList.idl',
             'dom/Comment.idl',
             'dom/CompositorProxy.idl',
@@ skipping 1296 matching lines @@
             'css/cssom/CSSTokenStreamValue.cpp',
             'css/cssom/CSSTokenStreamValue.h',
             'css/cssom/CSSTransformComponent.cpp',
             'css/cssom/CSSTransformComponent.h',
             'css/cssom/CSSTransformValue.cpp',
             'css/cssom/CSSTransformValue.h',
             'css/cssom/CSSTranslation.cpp',
             'css/cssom/CSSTranslation.h',
             'css/cssom/CSSUnsupportedStyleValue.cpp',
             'css/cssom/CSSUnsupportedStyleValue.h',
+            'css/cssom/CSSStyleVariableReferenceValue.h',
             'css/cssom/ComputedStylePropertyMap.cpp',
             'css/cssom/ComputedStylePropertyMap.h',
             'css/cssom/FilteredComputedStylePropertyMap.cpp',
             'css/cssom/FilteredComputedStylePropertyMap.h',
             'css/cssom/ImmutableStylePropertyMap.h',
             'css/cssom/InlineStylePropertyMap.cpp',
             'css/cssom/InlineStylePropertyMap.h',
             'css/cssom/MutableStylePropertyMap.h',
             'css/cssom/StylePropertyMap.cpp',
             'css/cssom/StylePropertyMap.h',
@@ skipping 2608 matching lines @@
             '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/StyleSheetContentsTest.cpp',
+            'css/cssom/CSSTokenStreamValueTest.cpp',
             'css/cssom/FilteredComputedStylePropertyMapTest.cpp',
             'css/invalidation/InvalidationSetTest.cpp',
             'css/parser/CSSParserFastPathsTest.cpp',
             'css/parser/CSSParserTokenTest.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',
@@ skipping 194 matching lines @@
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'timing/PerformanceBaseTest.cpp',
             'timing/PerformanceObserverTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'workers/WorkerThreadTestHelper.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }