<rdar://problem/4708119> REGRESSION: Cannot observe an AXTextField element directly

        ... and most of
        <rdar://problem/4708022> REGRESSION: TextRange-based attributes are missing from text fields
        <rdar://problem/4709515> REGRESSION: Expose text areas

        Remaining work for those two bugs in new bugs:

        <rdar://problem/4712101> Support NSAccessibilityVisibleCharacterRangeAttribute for AXTextField and AXTextArea elements
        <rdar://problem/4712111> Support NSAccessibilityInsertionPointLineNumberAttribute for AXTextArea elements
        <rdar://problem/4712125> Support setting NSAccessibilitySelectedTextAttribute for AXTextField and AXTextArea elements

        * bridge/AXObjectCache.h:
        (WebCore::AXObjectCache::postNotificationToElement):
        * bridge/mac/AXObjectCacheMac.mm:
        (WebCore::AXObjectCache::postNotification):
        (WebCore::AXObjectCache::postNotificationToElement):
        Removed postNotificationToTopWebArea.
        postNotification now posts to input element or top web area, as appropriate.
        postNotificationToElement posts to the specified element itself.
        
        * bridge/mac/FrameMac.h:
        * bridge/mac/FrameMac.mm:
        (WebCore::FrameMac::respondToChangedContents):
        Take a selection.  Pass the starting position's renderer to postNotification so that postNotification can post to the appropriate input element, if any.
        
        * bridge/mac/WebCoreAXObject.h:
        * bridge/mac/WebCoreAXObject.mm:
        (-[WebCoreAXObject isWebArea]):
        (-[WebCoreAXObject isAnchor]):
        (-[WebCoreAXObject isTextRange]):
        New convenience methods.
        
        (-[WebCoreAXObject role]):
        (-[WebCoreAXObject roleDescription])        
        (-[WebCoreAXObject value]):
        (-[WebCoreAXObject accessibilityDescription]):
        Support AXTextField and AXTextArea.

        (-[WebCoreAXObject accessibilityShouldUseUniqueId]):
        Register AXTextField and AXTextArea elements so notifications to them can be observed.
        
        (-[WebCoreAXObject accessibilityIsIgnored]):
        Use new convenience method isWebArea.

        (-[WebCoreAXObject accessibilityAttributeNames]):
        Simplify the array creation.
        Add text range support.
       
        (-[WebCoreAXObject accessibilityAttributeValue:]):
        Add text range support.
       
        (-[WebCoreAXObject canSetFocusAttribute]):
        (-[WebCoreAXObject canSetValueAttribute]):
        (-[WebCoreAXObject canSetTextRangeAttributes]):
        New convenience methods.
        
        (-[WebCoreAXObject accessibilityIsAttributeSettable:]):
        (-[WebCoreAXObject accessibilitySetValue:forAttribute:]):
        Add text range support.

        (-[WebCoreAXObject observableObject]):
        New to locate text field or text area to notify.
        
        * dom/Document.cpp:
        (WebCore::Document::updateSelection):
        Post AXSelectedTextChanged notification with new selection's start node.
        postNotification will send it to the input element, if there is one, or the top WebArea.
        
        (WebCore::Document::implicitClose):
        Use postNotificationToElement now that it acts like the old postNotification.
        
        * page/Frame.h:
        * page/Frame.cpp:
        (WebCore::Frame::appliedEditing):
        (WebCore::Frame::unappliedEditing):
        (WebCore::Frame::reappliedEditing):
        Pass the selection of interest to respondToChangedContents.
        
        * page/FrameView.cpp:
        (WebCore::FrameView::layout):
        Use postNotificationToElement now that it acts like the old postNotification.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@16169 268f45cc-cd09-0410-ab3c-d52691b4dbfc