CSS Custom Properties (Variables)

Source/core/core.gypi

Index: Source/core/core.gypi
diff --git a/Source/core/core.gypi b/Source/core/core.gypi
index 01cfd134459c0cc9d6099b8618ed1430f2fe5589..5e1624ca5cbfb610f55dedcabddabe903ded1bea 100644
--- a/Source/core/core.gypi
+++ b/Source/core/core.gypi
@@ -1128,6 +1128,8 @@
             'css/CSSValueList.cpp',
             'css/CSSValuePool.cpp',
             'css/CSSValuePool.h',
+            'css/CSSVariableData.cpp',
+            'css/CSSVariableData.h',
             'css/CSSViewportRule.cpp',
             'css/CSSViewportRule.h',
             'css/Counter.cpp',
@@ -1245,6 +1247,8 @@
             'css/parser/CSSSupportsParser.h',
             'css/parser/CSSTokenizer.cpp',
             'css/parser/CSSTokenizerInputStream.cpp',
+            'css/parser/CSSVariableParser.cpp',
+            'css/parser/CSSVariableParser.h',
             'css/parser/MediaQueryBlockWatcher.cpp',
             'css/parser/MediaQueryParser.cpp',
             'css/parser/SizesAttributeParser.cpp',
@@ -1253,6 +1257,8 @@
             'css/resolver/AnimatedStyleBuilder.h',
             'css/resolver/CSSToStyleMap.cpp',
             'css/resolver/CSSToStyleMap.h',
+            'css/resolver/CSSVariableResolver.cpp',
+            'css/resolver/CSSVariableResolver.h',
             'css/resolver/ElementResolveContext.cpp',
             'css/resolver/ElementResolveContext.h',
             'css/resolver/ElementStyleResources.cpp',