Create LineLayout api

Source/core/layout/api/LineLayoutText.h

+// Copyright 2015 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 LineLayoutText_h
+#define LineLayoutText_h
+
+#include "core/layout/LayoutText.h"
+#include "core/layout/api/LineLayoutItem.h"
+#include "platform/LayoutUnit.h"
+#include "platform/text/TextPath.h"
+#include "wtf/Forward.h"
+
+namespace blink {
+
+class LayoutText;
+
+class LineLayoutText : public LineLayoutItem {
+public:
+    LineLayoutText(LayoutText* layoutObject) : LineLayoutItem(layoutObject) { }
+    LineLayoutText(const LineLayoutItem&);
+    LineLayoutText() { }
+
+    bool isWordBreak() const;
+
+    bool isAllCollapsibleWhitespace() const;
+
+    UChar characterAt(unsigned) const;
+    unsigned textLength() const;
+
+private:
+    LayoutText* text() { return toLayoutText(layoutObject()); }
+    const LayoutText* text() const { return toLayoutText(layoutObject()); }
+};
+
+} // namespace blink
+
+#endif // LineLayoutText_h