Basic implementation of @apply

third_party/WebKit/Source/core/css/parser/CSSVariableParser.cpp

Index: third_party/WebKit/Source/core/css/parser/CSSVariableParser.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSVariableParser.cpp b/third_party/WebKit/Source/core/css/parser/CSSVariableParser.cpp
index f0255092bbf02a08bd8b66a4ec30268f4092c2b7..a54302eac4ea4fbd6bd498d6e4ff525bb4b30a55 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSVariableParser.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSVariableParser.cpp
@@ -47,6 +47,13 @@ bool classifyBlock(CSSParserTokenRange range, bool& hasReferences, bool isTopLev
 
         const CSSParserToken& token = range.consume();
         switch (token.type()) {
+        case AtKeywordToken: {
+            // This might have false positives if the @apply doesn't actually match
+            // the syntax, but that just means we do extra computation work.
+            if (token.valueEqualsIgnoringASCIICase("apply"))
+                hasReferences = true;
+            break;
+        }
         case DelimiterToken: {
             if (token.delimiter() == '!' && isTopLevelBlock)
                 return false;