Reviewed by Darin Adler.

        Tests for maxLength of <textarea>
        https://bugs.webkit.org/show_bug.cgi?id=29292

        * fast/forms/script-tests/textarea-maxlength.js: Added.
        * fast/forms/textarea-maxlength-expected.txt: Added.
        * fast/forms/textarea-maxlength.html: Added.
2009-09-23  Kent Tamura  <tkent@chromium.org>

        Reviewed by Darin Adler.

        - Support for maxLength of <textarea>
        - Move numGraphemeClusters() and numCharactersInGraphemeClusters() from InputElement to String.
        https://bugs.webkit.org/show_bug.cgi?id=29292

        Test: fast/forms/textarea-maxlength.html

        * dom/InputElement.cpp:
        (WebCore::InputElement::sanitizeUserInputValue):
        (WebCore::InputElement::handleBeforeTextInsertedEvent):
        * html/HTMLTextAreaElement.cpp:
        (WebCore::HTMLTextAreaElement::defaultEventHandler):
        (WebCore::HTMLTextAreaElement::handleBeforeTextInsertedEvent):
        (WebCore::HTMLTextAreaElement::sanitizeUserInputValue):
        (WebCore::HTMLTextAreaElement::maxLength):
        (WebCore::HTMLTextAreaElement::setMaxLength):
        * html/HTMLTextAreaElement.h:
        * html/HTMLTextAreaElement.idl:
        * platform/text/PlatformString.h:
        * platform/text/String.cpp:
        (WebCore::String::numGraphemeClusters):
        (WebCore::String::numCharactersInGraphemeClusters):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@48698 268f45cc-cd09-0410-ab3c-d52691b4dbfc