Basic implementation of @apply

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

Index: third_party/WebKit/Source/core/css/parser/CSSAtRuleID.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSAtRuleID.cpp b/third_party/WebKit/Source/core/css/parser/CSSAtRuleID.cpp
index 809d03589f331992c7be362acc5b93be8bdc159d..881986c7d5c1a3578ef17c64cbfee0eade969f7d 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSAtRuleID.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSAtRuleID.cpp
@@ -31,6 +31,8 @@ CSSAtRuleID cssAtRuleID(const CSSParserString& name)
         return CSSAtRuleViewport;
     if (name.equalIgnoringASCIICase("-webkit-keyframes"))
         return CSSAtRuleWebkitKeyframes;
+    if (name.equalIgnoringASCIICase("apply"))
+        return CSSAtRuleApply;
     return CSSAtRuleInvalid;
 }
 
@@ -72,6 +74,10 @@ void countAtRule(UseCounter* useCounter, CSSAtRuleID ruleId)
         feature = UseCounter::CSSAtRuleWebkitKeyframes;
         break;
 
+    case CSSAtRuleApply:
+        feature = UseCounter::CSSAtRuleApply;
+        break;
+
     case CSSAtRuleInvalid:
         // fallthrough
     default: