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diff --git a/Source/WebCore/dom/DOMTextContentWalker.h b/Source/WebCore/dom/DOMTextContentWalker.h
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+/*
+ * Copyright (C) 2011 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 DOMTextContentWalker_h
+#define DOMTextContentWalker_h
+
+#if OS(ANDROID)
+
+#include "PlatformString.h"
+
+namespace WebCore {
+
+class Range;
+class VisiblePosition;
+
+// Explore the DOM tree to find the text contents up to a limit
+// around a position in a given text node.
+class DOMTextContentWalker {
+  WTF_MAKE_NONCOPYABLE(DOMTextContentWalker);
+public:
+  DOMTextContentWalker(const VisiblePosition& position, unsigned maxLength);
+
+  String content() const;
+  unsigned hitOffsetInContent() const;
+
+  // Convert start/end positions in the content text string into a text range.
+  PassRefPtr<Range> contentOffsetsToRange(unsigned startInContent, unsigned endInContent);
+
+private:
+  RefPtr<Range> m_contentRange;
+  size_t m_hitOffsetInContent;
+};
+
+} // namespace WebCore
+
+#endif // OS(ANDROID)
+
+#endif // DOMTextContentWalker_h
+