Introduce BorderImageLength and BorderImageLengthBox

Source/platform/BorderImageLength.h

+/*
+ * Copyright (c) 2013, Opera Software ASA. 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 Opera Software ASA 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.
+ */
+
+#ifndef BorderImageLength_h
+#define BorderImageLength_h
+
+#include "platform/Length.h"
+
+namespace WebCore {
+
+class PLATFORM_EXPORT BorderImageLength {

[Julien - ping for review, 2013/11/04 16:31:40]

I like the new name.

It may be worth adding a comment to say what it represents (same with
BorderImageLengthBox). Ideally with a link to one of the properties' definition
for good measure.

+public:
+    BorderImageLength()
+    {
+    }
+
+    BorderImageLength(double number)
+        : m_length(number, Relative)
+    {
+    }
+
+    BorderImageLength(const Length& length)
+        : m_length(length)
+    {
+    }
+
+    bool isNumber() const { return m_length.isRelative(); }
+    bool isLength() const { return !isNumber(); }
+
+    const Length& length() const { ASSERT(isLength()); return m_length; }
+    Length& length() { ASSERT(isLength()); return m_length; }
+
+    double number() const { ASSERT(isNumber()); return m_length.value(); }
+
+    // FIXME: Remove when the conversion to LengthOrMultipleOfBorderWidthBox is complete

[Julien - ping for review, 2013/11/04 16:31:40]

Nit: Sentences end with a dot :)

(I haven't repeated this nitpick to the other comments in BorderImageLengthBox)

+    Length deprecatedUnifiedLength() const { return m_length; }
+
+    bool operator==(const BorderImageLength& o) const
+    {
+        return m_length == o.m_length;
+    }
+
+    bool isZero() const
+    {
+        return m_length.isZero();
+    }
+
+private:
+    Length m_length;
+};
+
+} // namespace WebCore
+
+#endif // BorderImageLength_h