Create LineLayout api

Source/core/layout/api/LineLayoutText.cpp

Index: Source/core/layout/api/LineLayoutText.cpp
diff --git a/Source/core/layout/api/LineLayoutText.cpp b/Source/core/layout/api/LineLayoutText.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..1bc8f796f7989f53f0ea9d08328413c04a9657a4
--- /dev/null
+++ b/Source/core/layout/api/LineLayoutText.cpp
@@ -0,0 +1,36 @@
+// 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.
+
+#include "config.h"
+#include "core/layout/api/LineLayoutText.h"
+
+namespace blink {
+
+LineLayoutText::LineLayoutText(const LineLayoutItem& item)
+    : LineLayoutItem(item)
+{
+    ASSERT(!item.layoutObject() || item.layoutObject()->isText());
+}
+
+bool LineLayoutText::isWordBreak() const
+{
+    return toText()->isWordBreak();
+}
+
+bool LineLayoutText::isAllCollapsibleWhitespace() const
+{
+    return toText()->isAllCollapsibleWhitespace();
+}
+
+UChar LineLayoutText::characterAt(unsigned offset) const
+{
+    return toText()->characterAt(offset);
+}
+
+unsigned LineLayoutText::textLength() const
+{
+    return toText()->textLength();
+}
+
+} // namespace blink