Create LineLayout api

Source/core/layout/api/LineLayoutText.h

Index: Source/core/layout/api/LineLayoutText.h
diff --git a/Source/core/layout/api/LineLayoutText.h b/Source/core/layout/api/LineLayoutText.h
new file mode 100644
index 0000000000000000000000000000000000000000..3524afd2afeb53dc6a42d0b4270aa8f217f18ab7
--- /dev/null
+++ b/Source/core/layout/api/LineLayoutText.h
@@ -0,0 +1,57 @@
+// 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:
+    explicit LineLayoutText(LayoutText* layoutObject) : LineLayoutItem(layoutObject) { }
+
+    LineLayoutText(const LineLayoutItem& item)
+        : LineLayoutItem(item)
+    {
+        ASSERT(!item || item.isText());
+    }
+
+    LineLayoutText() { }
+
+    bool isWordBreak() const
+    {
+        return toText()->isWordBreak();
+    }
+
+    bool isAllCollapsibleWhitespace() const
+    {
+        return toText()->isAllCollapsibleWhitespace();
+    }
+
+    UChar characterAt(unsigned offset) const
+    {
+        return toText()->characterAt(offset);
+    }
+
+    unsigned textLength() const
+    {
+        return toText()->textLength();
+    }
+
+private:
+    LayoutText* toText() { return toLayoutText(layoutObject()); }
+    const LayoutText* toText() const { return toLayoutText(layoutObject()); }
+};
+
+} // namespace blink
+
+#endif // LineLayoutText_h