Parser support for >>> (shadow-piercing descendant) combinator.

third_party/WebKit/Source/core/css/parser/CSSParserMode.h

Index: third_party/WebKit/Source/core/css/parser/CSSParserMode.h
diff --git a/third_party/WebKit/Source/core/css/parser/CSSParserMode.h b/third_party/WebKit/Source/core/css/parser/CSSParserMode.h
index 9b2c770c632e96e6ce2cd8512c1b9779e6c7d14d..44d679dd92312d4b4dfdc97115ca40da268778a2 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSParserMode.h
+++ b/third_party/WebKit/Source/core/css/parser/CSSParserMode.h
@@ -88,7 +88,9 @@ class CORE_EXPORT CSSParserContext {
   // https://drafts.csswg.org/selectors/#profiles
   enum SelectorProfile { DynamicProfile, StaticProfile };
 
-  CSSParserContext(CSSParserMode, UseCounter*);
+  CSSParserContext(CSSParserMode,
+                   UseCounter*,
+                   SelectorProfile = DynamicProfile);
   // FIXME: We shouldn't need the UseCounter argument as we could infer it from
   // the Document but some callers want to disable use counting (e.g. the
   // WebInspector).