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diff --git a/Tools/DumpRenderTree/chromium/MockSpellCheck.cpp b/Tools/DumpRenderTree/chromium/MockSpellCheck.cpp
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+/*
+ * Copyright (C) 2010 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:
+ *
+ *     * 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 Google Inc. 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.
+ */
+
+#include "config.h"
+#include "MockSpellCheck.h"
+
+#include "WebString.h"
+#include <wtf/ASCIICType.h>
+#include <wtf/Assertions.h>
+#include <wtf/text/WTFString.h>
+
+using namespace WebKit;
+
+MockSpellCheck::MockSpellCheck()
+    : m_initialized(false) {}
+
+MockSpellCheck::~MockSpellCheck() {}
+
+static bool isNotASCIIAlpha(UChar ch) { return !isASCIIAlpha(ch); }
+
+bool MockSpellCheck::spellCheckWord(const WebString& text, int* misspelledOffset, int* misspelledLength)
+{
+    ASSERT(misspelledOffset);
+    ASSERT(misspelledLength);
+
+    // Initialize this spellchecker.
+    initializeIfNeeded();
+
+    // Reset the result values as our spellchecker does.
+    *misspelledOffset = 0;
+    *misspelledLength = 0;
+
+    // Convert to a String because we store String instances in
+    // m_misspelledWords and WebString has no find().
+    const WTF::String stringText(text.data(), text.length());
+
+    // Extract the first possible English word from the given string.
+    // The given string may include non-ASCII characters or numbers. So, we
+    // should filter out such characters before start looking up our
+    // misspelled-word table.
+    // (This is a simple version of our SpellCheckWordIterator class.)
+    // If the given string doesn't include any ASCII characters, we can treat the
+    // string as valid one.
+    // Unfortunately, This implementation splits a contraction, i.e. "isn't" is
+    // split into two pieces "isn" and "t". This is OK because webkit tests
+    // don't have misspelled contractions.
+    int wordOffset = stringText.find(isASCIIAlpha);
+    if (wordOffset == -1)
+        return true;
+    int wordEnd = stringText.find(isNotASCIIAlpha, wordOffset);
+    int wordLength = wordEnd == -1 ? stringText.length() - wordOffset : wordEnd - wordOffset;
+
+    // Look up our misspelled-word table to check if the extracted word is a
+    // known misspelled word, and return the offset and the length of the
+    // extracted word if this word is a known misspelled word.
+    // (See the comment in MockSpellCheck::initializeIfNeeded() why we use a
+    // misspelled-word table.)
+    WTF::String word = stringText.substring(wordOffset, wordLength);
+    if (!m_misspelledWords.contains(word))
+        return true;
+
+    *misspelledOffset = wordOffset;
+    *misspelledLength = wordLength;
+    return false;
+}
+
+void MockSpellCheck::fillSuggestionList(const WebString& word, Vector<WebString>* suggestions)
+{
+    if (word == WebString::fromUTF8("wellcome"))
+        suggestions->append(WebString::fromUTF8("welcome"));
+}
+
+bool MockSpellCheck::initializeIfNeeded()
+{
+    // Exit if we have already initialized this object.
+    if (m_initialized)
+        return false;
+
+    // Create a table that consists of misspelled words used in WebKit layout
+    // tests.
+    // Since WebKit layout tests don't have so many misspelled words as
+    // well-spelled words, it is easier to compare the given word with misspelled
+    // ones than to compare with well-spelled ones.
+    static const char* misspelledWords[] = {
+        // These words are known misspelled words in webkit tests.
+        // If there are other misspelled words in webkit tests, please add them in
+        // this array.
+        "foo",
+        "Foo",
+        "baz",
+        "fo",
+        "LibertyF",
+        "chello",
+        "xxxtestxxx",
+        "XXxxx",
+        "Textx",
+        "blockquoted",
+        "asd",
+        "Lorem",
+        "Nunc",
+        "Curabitur",
+        "eu",
+        "adlj",
+        "adaasj",
+        "sdklj",
+        "jlkds",
+        "jsaada",
+        "jlda",
+        "zz",
+        "contentEditable",
+        // The following words are used by unit tests.
+        "ifmmp",
+        "qwertyuiopasd",
+        "qwertyuiopasdf",
+        "wellcome"
+    };
+
+    m_misspelledWords.clear();
+    for (size_t i = 0; i < arraysize(misspelledWords); ++i)
+        m_misspelledWords.add(WTF::String::fromUTF8(misspelledWords[i]), false);
+
+    // Mark as initialized to prevent this object from being initialized twice
+    // or more.
+    m_initialized = true;
+
+    // Since this MockSpellCheck class doesn't download dictionaries, this
+    // function always returns false.
+    return false;
+}