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diff --git a/Source/WebCore/css/CSSFontFamily.h b/Source/WebCore/css/CSSFontFamily.h
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+++ b/Source/WebCore/css/CSSFontFamily.h
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+/*
+ * Copyright (C) 2015 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:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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/WTFString.h>
+
+namespace WebCore {
+
+// We use a CSSFontFamily instead of a String to store the font family inside CSSPrimitiveValue.
+// This is because require an extra bit to determine if the font family was resolved by the CSS
+// parser from a system font ID (caption | icon | menu | message-box | small-caption |
+// status-bar).
+//
+// This is needed by the StyleBuilder to correctly set the "isSpecifiedFont" flag on the
+// FontDescription. This flag is used to determine if we should do the "use backslash as Yen
+// sign" hack.
+
+struct CSSFontFamily {
+    String familyName;
+    bool fromSystemFontID;
+};
+
+inline bool operator==(const CSSFontFamily& a, const CSSFontFamily& b)
+{
+    return a.familyName == b.familyName && a.fromSystemFontID == b.fromSystemFontID;
+}
+
+} // namespace WebCore