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diff --git a/Source/WebCore/css/parser/CSSAtRuleID.h b/Source/WebCore/css/parser/CSSAtRuleID.h
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+++ b/Source/WebCore/css/parser/CSSAtRuleID.h
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+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Copyright (C) 2016 Apple Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#pragma once
+#include <wtf/text/StringView.h>
+
+namespace WebCore {
+
+enum CSSAtRuleID {
+    CSSAtRuleInvalid = 0,
+
+    CSSAtRuleCharset = 1,
+    CSSAtRuleFontFace = 2,
+    CSSAtRuleImport = 3,
+    CSSAtRuleKeyframes = 4,
+    CSSAtRuleMedia = 5,
+    CSSAtRuleNamespace = 6,
+    CSSAtRulePage = 7,
+    CSSAtRuleSupports = 8,
+    CSSAtRuleViewport = 9,
+
+    CSSAtRuleWebkitKeyframes = 10,
+    CSSAtRuleApply = 11,
+    CSSAtRuleWebkitRegion = 12
+};
+
+CSSAtRuleID cssAtRuleID(StringView name);
+
+} // namespace WebCore