Reviewed by Darin.

        - JavaScriptCore side of fix for <rdar://problem/4308243> 8F36 
        Regression: crash in malloc_consolidate if you use a .PAC file

        The crash was a result of threaded deallocation of thread-unsafe
        objects. Pure JS objects are thread-safe because all JS execution
        is synchronized through JSLock. However, JS objects that wrap WebCore 
        objects are thread-unsafe because JS and WebCore execution are not 
        synchronized.  That unsafety comes into play when the collector 
        deallocates a JS object that wraps a WebCore object, thus causing the 
        WebCore object to be deallocated.

        The solution here is to have each JSCell know whether it is safe to
        collect on a non-main thread, and to avoid collecting unsafe cells
        when on a non-main thread.

        We don't have a way to test PAC files yet, so there's no test
        attached to this patch.

        * kjs/collector.cpp:
        (KJS::Collector::collect):
        (1) Added the test "currentThreadIsMainThread || 
        imp->m_destructorIsThreadSafe". 

        * kjs/protect.h:
        (KJS::gcProtectNullTolerant):
        (KJS::gcUnprotectNullTolerant):
        * kjs/value.h:
        (KJS::JSCell::JSCell): The bools here must be bitfields, otherwise
        m_destructorIsThreadSafe becomes another whole word, ruining the
        collector optimizations we've made based on the size of a JSObject.
        * kxmlcore/FastMalloc.cpp:
        (KXMLCore::currentThreadIsMainThread):
        (KXMLCore::fastMallocRegisterThread):
        * kxmlcore/FastMalloc.h:

WebCore:

        Reviewed by Hyatt.

        - Fix for http://bugzilla.opendarwin.org/show_bug.cgi?id=6986
        Switch to use new text field implementation for <input type="text">

        * css/html4.css: Added default style info for new text fields.
        * rendering/RenderTextField.cpp:
        (WebCore::RenderTextField::createDivStyle): Added an extra 1px of padding on the left & right to match Win IE & the latest Mozilla.
        (WebCore::RenderTextField::updateFromElement): Removed some outdated comments.  Cleaned up the way we add text nodes to the div.
        (WebCore::RenderTextField::setSelectionStart): Tweaked selection code to better match Mozilla behavior.
        (WebCore::RenderTextField::setSelectionEnd): ditto.
        (WebCore::RenderTextField::select): Cleaned this up by having it call setSelectionRange.
        (WebCore::RenderTextField::setSelectionRange): Calls updateLayout now in case this is called in an onload handler, and no other layout has occurred.
        (WebCore::RenderTextField::calcMinMaxWidth): Use floatWidth to calculate the width of the "0" character.
        * rendering/RenderTheme.cpp: (WebCore::RenderTheme::isControlStyled): If the text field's specified border is different from 
         the default border, then treat the control as styled, so the engine knows to turn off the aqua appearance.
        * rendering/RenderThemeMac.mm:
        (WebCore::RenderThemeMac::paintTextField): return false so the engine knows not to try to draw the border.
        (WebCore::RenderThemeMac::adjustTextFieldStyle): text field style info has been moved to html4.css. 
         We also add intrinsic margins here if the font size is large enough.
        * html/HTMLTextFieldInnerElement.cpp: (WebCore::HTMLTextFieldInnerElement::defaultEventHandler):
         No longer check for appearance. All text fields with m_type == TEXT will use the new implementation.
        * html/HTMLInputElement.cpp:
        (WebCore::HTMLInputElement::isKeyboardFocusable): ditto.
        (WebCore::HTMLInputElement::focus): ditto.
        (WebCore::HTMLInputElement::selectionStart): ditto.
        (WebCore::HTMLInputElement::selectionEnd): ditto.
        (WebCore::HTMLInputElement::setSelectionStart): ditto.
        (WebCore::HTMLInputElement::setSelectionEnd): ditto.
        (WebCore::HTMLInputElement::select): ditto.
        (WebCore::HTMLInputElement::setSelectionRange): ditto.
        (WebCore::HTMLInputElement::createRenderer): ditto.
        (WebCore::HTMLInputElement::defaultEventHandler): ditto.
        (WebCore::HTMLInputElement::isMouseFocusable): Added.  Old text fields relied on the widget to provide a focus policy.  
         A text field that is focusable should be mouse focusable, and shouldn't need to ask the base class.
        * html/HTMLInputElement.h: Added isMouseFocusable.
        * html/HTMLGenericFormElement.cpp: (WebCore::HTMLGenericFormElement::isMouseFocusable):
         Removed specific text field code since that is now done in HTMLInputElement::isMouseFocusable.
        * dom/Document.cpp: (WebCore::Document::clearSelectionIfNeeded): Check that the new selection is does not have a shadowAncestorNode that is focused.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@13568 268f45cc-cd09-0410-ab3c-d52691b4dbfc