A sizes attribute parser

Source/core/css/parser/SizesAttributeParser.h

Index: Source/core/css/parser/SizesAttributeParser.h
diff --git a/Source/core/css/parser/SizesAttributeParser.h b/Source/core/css/parser/SizesAttributeParser.h
new file mode 100644
index 0000000000000000000000000000000000000000..4c6b73f8a4d0b17c4ec2e8ba5c0b864e6251db80
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+++ b/Source/core/css/parser/SizesAttributeParser.h
@@ -0,0 +1,40 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SizesAttributeParser_h
+#define SizesAttributeParser_h
+
+#include "core/css/MediaValues.h"
+#include "core/css/parser/MediaQueryParser.h"
+#include "wtf/text/WTFString.h"
+
+namespace WebCore {
+
+class SizesAttributeParser {
+public:
+    static unsigned findEffectiveSize(const String& attribute, PassRefPtr<MediaValues>);
+
+private:
+    SizesAttributeParser(PassRefPtr<MediaValues> mediaValues)
+        : m_mediaValues(mediaValues)
+        , m_length(0)
+    {
+    }
+
+    bool parse(Vector<MediaQueryToken>& tokens);
+    bool parseMediaConditionAndLength(TokenIterator startToken, TokenIterator endToken);
+    unsigned effectiveSize();
+    bool calculateLengthInPixels(TokenIterator startToken, TokenIterator endToken, unsigned& result);
+    bool mediaConditionMatches(PassRefPtr<MediaQuerySet> mediaCondition);
+    unsigned effectiveSizeDefaultValue();
+
+    RefPtr<MediaQuerySet> m_mediaCondition;
+    RefPtr<MediaValues> m_mediaValues;

[eseidel, 2014/04/14 23:10:13]

Are these always cached or dynamic?  Can this be a more specific type?

+    unsigned m_length;
+};
+
+} // namespace
+
+#endif
+