Reviewed by Darin.

        This is the WebCore half of pushing elementAtPoint and the backend 
        of WebElementDictionary into WebCore. Most of the changes below are 
        to accommodate one of the following:
                
        -NodeInfo is now a stand-alone class called HitTestResult. 
                Previously it was defined in RenderObject.h, but not for 
                any particular reason. The WebElementDictionary 
                functionality that was pushed into WebCore has been pushed 
                specifically into the this class. In fact, 
                WebElementDictionary now keeps a HitTestResult as a member 
                varibale.
                
        -The enumeration AccessPolicy is now called 
                ClipboardAccessPolicy and is defined in its own header. It 
                was previously defined in ClipboardMac.h, but is now 
                defined independently to avoid including ClipboardMac.h 
                from within FrameMac.h since FrameMac.h is now included in 
                WebElementDictionary.m in WebKit.
                
        -Element now has a virtual target() for the sake of 
                NodeInfo::targetFrame() 

        * WebCore.exp: Several WebCore functions are newly called from 
        WebKit, so they have been added here. 
        * WebCore.xcodeproj/project.pbxproj:
        * bindings/objc/DOM.mm: Must include Image.h because of adjustments 
        to ClipboardMac.
        * bridge/mac/FrameMac.h: Adjust to HitTestResult changes.
        * bridge/mac/FrameMac.mm:
        (WebCore::FrameMac::freeClipboard): Adjust to ClipboardAccessPolicy 
        and HitTestResult changes.
        (WebCore::FrameMac::eventMayStartDrag): Same.
        (WebCore::FrameMac::handleMouseMoveEvent): Same.
        (WebCore::FrameMac::dispatchCPPEvent): Same.
        (WebCore::FrameMac::mayDHTMLCut): Same.
        (WebCore::FrameMac::mayDHTMLCopy): Same.
        (WebCore::FrameMac::mayDHTMLPaste): Same.
        (WebCore::FrameMac::tryDHTMLCut): Same
        (WebCore::FrameMac::tryDHTMLCopy): Same.
        (WebCore::FrameMac::tryDHTMLPaste): Same.
        * bridge/mac/WebCoreAXObject.mm:
        (-[WebCoreAXObject doAXTextMarkerForPosition:]): Adjust to 
        HitTestResult changes.
        (-[WebCoreAXObject accessibilityHitTest:]): Same.
        * bridge/mac/WebCoreFrameBridge.h: Same.
        * bridge/mac/WebCoreFrameBridge.mm:
        (-[WebCoreFrameBridge dragOperationForDraggingInfo:]): Adjust for 
        ClipboardAccessPolicy changes.
        (-[WebCoreFrameBridge dragExitedWithDraggingInfo:]): Same.
        (-[WebCoreFrameBridge concludeDragForDraggingInfo:]): Same.
        * dom/Document.cpp:
        (WebCore::Document::elementFromPoint): Adjust for HitTestResult 
        changes.
        (WebCore::Document::prepareMouseEvent): Same.
        * dom/Element.h:
        (WebCore::Element::target): Now has a virtual target()
        * html/HTMLAnchorElement.h: Same.
        * html/HTMLAreaElement.cpp:
        (WebCore::HTMLAreaElement::mapMouseEvent): Adjust for HitTestResult 
        changes.
        * html/HTMLAreaElement.h: Virtual target()
        * html/HTMLBaseElement.h:
        (WebCore::HTMLBaseElement::target): Same.
        * html/HTMLFormElement.h: Same.
        * html/HTMLLinkElement.h: Same.
        * html/HTMLMapElement.cpp:
        (WebCore::HTMLMapElement::mapMouseEvent): Adjust for HitTestResult 
        changes.
        * html/HTMLMapElement.h: Same.
        * page/Frame.cpp:
        (WebCore::Frame::isPointInsideSelection): Same.
        (WebCore::Frame::hitTestResultAtPoint): Same. 
        * page/Frame.h: Same.
        * page/FrameView.cpp:
        (WebCore::FrameView::handleWheelEvent): Same.
        * platform/mac/ClipboardAccessPolicy.h: Added.
        (WebCore::):
        * platform/mac/ClipboardMac.h: Remove definition of AccessPolicy, 
        include ClipboardAccessPolicy.h, and rename AccessPolicy to 
        ClipboardAccessPolicy.
        * platform/mac/ClipboardMac.mm: Rename ClipboardAccessPolicy.
        (WebCore::ClipboardMac::ClipboardMac):
        (WebCore::ClipboardMac::setAccessPolicy):
        (WebCore::ClipboardMac::clearData):
        (WebCore::ClipboardMac::clearAllData):
        (WebCore::ClipboardMac::getData):
        (WebCore::ClipboardMac::setData):
        (WebCore::ClipboardMac::types):
        (WebCore::ClipboardMac::setDragImage):
        (WebCore::ClipboardMac::setDropEffect):
        (WebCore::ClipboardMac::setEffectAllowed):
        * rendering/EllipsisBox.cpp:
        (WebCore::EllipsisBox::nodeAtPoint): Adjust for HitTestResult 
        changes.
        * rendering/EllipsisBox.h:
        * rendering/HitTestResult.cpp: Added.
        (WebCore::HitTestResult::HitTestResult):
        (WebCore::HitTestResult::~HitTestResult):
        (WebCore::HitTestResult::operator=):
        (WebCore::HitTestResult::setInnerNode):
        (WebCore::HitTestResult::setInnerNonSharedNode):
        (WebCore::HitTestResult::setURLElement):
        (WebCore::HitTestResult::setScrollbar):
        (WebCore::HitTestResult::targetFrame):
        (WebCore::HitTestResult::boundingBox):
        (WebCore::HitTestResult::isSelected):
        (WebCore::HitTestResult::title):
        * rendering/HitTestResult.h: Added.
        (WebCore::HitTestResult::readonly):
        (WebCore::HitTestResult::active):
        (WebCore::HitTestResult::mouseMove):
        (WebCore::HitTestResult::innerNode):
        (WebCore::HitTestResult::innerNonSharedNode):
        (WebCore::HitTestResult::point):
        (WebCore::HitTestResult::URLElement):
        (WebCore::HitTestResult::scrollbar):
        (WebCore::HitTestResult::setPoint):
        (WebCore::HitTestResult::setReadonly):
        (WebCore::HitTestResult::setActive):
        (WebCore::HitTestResult::setMouseMove):
        * rendering/InlineBox.cpp:
        (WebCore::InlineBox::nodeAtPoint): Adjust to HitTestResult changes.
        * rendering/InlineBox.h: Same.
        * rendering/InlineFlowBox.cpp:
        (WebCore::InlineFlowBox::nodeAtPoint): Same.
        * rendering/InlineFlowBox.h: Same.
        * rendering/InlineTextBox.cpp: 
        (WebCore::InlineTextBox::nodeAtPoint): Same.
        * rendering/InlineTextBox.h: Same.
        * rendering/RenderBlock.cpp:
        (WebCore::RenderBlock::isPointInScrollbar): Same.
        (WebCore::RenderBlock::nodeAtPoint): Same.
        * rendering/RenderBlock.h: Same.
        * rendering/RenderBox.cpp:
        (WebCore::RenderBox::nodeAtPoint): Same.
        * rendering/RenderBox.h: Same.
        * rendering/RenderFlow.cpp:
        (WebCore::RenderFlow::hitTestLines): Same.
        * rendering/RenderFlow.h: Same.
        * rendering/RenderForeignObject.cpp:
        (WebCore::RenderForeignObject::nodeAtPoint): Same.
        * rendering/RenderForeignObject.h: Same.
        * rendering/RenderFrameSet.cpp:
        (WebCore::RenderFrameSet::nodeAtPoint): Same.
        * rendering/RenderFrameSet.h: Same.
        * rendering/RenderImage.cpp:
        (WebCore::RenderImage::nodeAtPoint): Same.
        * rendering/RenderImage.h: Same.
        * rendering/RenderInline.cpp:
        (WebCore::RenderInline::nodeAtPoint): Same.
        * rendering/RenderInline.h: Same.
        * rendering/RenderLayer.cpp:
        (WebCore::RenderLayer::autoscroll): Same.
        (WebCore::RenderLayer::hitTest): Same.
        (WebCore::RenderLayer::hitTestLayer): Same.
        (WebCore::RenderLayer::updateHoverActiveState): Same.
        * rendering/RenderLayer.h: Same.
        * rendering/RenderListBox.cpp:
        (WebCore::RenderListBox::isPointInScrollbar): Same.
        * rendering/RenderListBox.h: Same.
        * rendering/RenderObject.cpp:
        (WebCore::RenderObject::hitTest): Same.
        (WebCore::RenderObject::setInnerNode): Same.
        (WebCore::RenderObject::nodeAtPoint): Same.
        * rendering/RenderObject.h: Remove NodeInfo class and forward 
        declare HitTestResult.
        * rendering/RenderPath.cpp:
        (WebCore::RenderPath::nodeAtPoint): Adjust to HitTestResult 
        changes.
        * rendering/RenderPath.h: Same.
        * rendering/RenderSVGImage.cpp:
        (WebCore::RenderSVGImage::nodeAtPoint): Same.
        * rendering/RenderSVGImage.h: Same
        * rendering/RenderSVGText.cpp:
        (WebCore::RenderSVGText::nodeAtPoint): Same.
        * rendering/RenderSVGText.h: Same.
        * rendering/RenderTableRow.cpp:
        (WebCore::RenderTableRow::nodeAtPoint): Same.
        * rendering/RenderTableRow.h: Same.
        * rendering/RenderTableSection.cpp:
        (WebCore::RenderTableSection::nodeAtPoint): Same.
        * rendering/RenderTableSection.h: Same.
        * rendering/RenderText.h: Same.
        (WebCore::RenderText::nodeAtPoint): Same.
        * rendering/RenderTextControl.cpp:
        (WebCore::RenderTextControl::nodeAtPoint): Same.
        * rendering/RenderTextControl.h: Same.
        * rendering/RootInlineBox.cpp:
        (WebCore::RootInlineBox::nodeAtPoint): Same.
        * rendering/RootInlineBox.h: Same.

WebKit:
        Reviewed by Darin.

        This is the WebKit half of pushing the guts of elementAtPoint and 
        WebElementDictionary into WebCore. Among other things, this patch 
        makes WebElementDictionary.m and WebHTMLView.m Objective-C++

        * MigrateHeaders.make: Add DOMElementInternal.h to the list of 
        headers to migrate.
        * Misc/WebElementDictionary.h: Replaced DOMNode, DOMElement, and 
        NSPoint member variables with a HitTestResult member variable.
        * Misc/WebElementDictionary.m:
        (addLookupKey): Formatting.
        (-[WebElementDictionary initWithHitTestResult:]): Constructor just 
        takes a HitTestResult now and sets the member variable.
        (-[WebElementDictionary dealloc]): delete HitTestResult.
        (-[WebElementDictionary finalize]): Address HitTestResult.
        (-[WebElementDictionary _domNode]): Use HitTestResult and call into 
        WebCore.
        (-[WebElementDictionary objectForKey:]): Same.
        (-[WebElementDictionary _webFrame]): Same.
        (-[WebElementDictionary _targetWebFrame]): Same.
        (-[WebElementDictionary _title]): Same.
        (-[WebElementDictionary _imageRect]): Same.
        (-[WebElementDictionary _isSelected]): Same.
        * WebKit.xcodeproj/project.pbxproj:
        * WebView/WebFrame.mm:
        (core): Convert from DOMNode* to Node*
        (kit): Convert from Node* to DOMNode*
        * WebView/WebFrameInternal.h: Support for the above.
        * WebView/WebHTMLView.m:
        (-[WebHTMLView elementAtPoint:allowShadowContent:]): Call directly 
        into Frame.cpp to get HitTestResult.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@17399 268f45cc-cd09-0410-ab3c-d52691b4dbfc