liver Hunt  <oliver@apple.com>

        Reviewed by Adam.
WebCore:
        Migrate more drag and drop logic to WebCore, start preparing
        to move EventHandler::handleDrag from EventHandlerMac to EventHandler 

        * WebCore.exp:   
          updating methods
                    
        * dom/Clipboard.cpp:
        * dom/Clipboard.h:
        (WebCore::Clipboard::Clipboard):
        (WebCore::Clipboard::setDragHasStarted):
        (WebCore::Clipboard::dragStarted): 
          Moving from ClipboardMac to Clipboard 

        * dom/EventTargetNode.cpp:
        (WebCore::EventTargetNode::dispatchMouseEvent):
          PlatformMouseEvent no longer lies about button state, however 
          DOM Events don't allow NoButton, so we need to convert NoButton 
          to LeftButton when we create a DOM Event from PlatformMouseEvent

        * page/DragClient.h:
          Tidying comment 

        * page/DragController.cpp:
        (WebCore::createMouseEvent):
          Updated for new PlatformMouseEvent constructors
        (WebCore::DragController::mayStartDragAtEventLocation):
          Migrated from WebKit

        * page/DragController.h:
          Added above function declarations

        * page/EventHandler.cpp:
        (WebCore::EventHandler::dragState): 
        (WebCore::EventHandler::dragHysteresisExceeded):
        (WebCore::EventHandler::freeClipboard):
        (WebCore::EventHandler::shouldDragAutoNode):
          Moved from EventHandlerMac
        (WebCore::EventHandler::handleMouseMoveEvent):
        (WebCore::EventHandler::eventMayStartDrag):
        (WebCore::EventHandler::handleMousePressEvent):
          Use DragController     

        * page/EventHandler.h:
          Added DragState struct definition to EventHandler

        * page/mac/EventHandlerMac.mm:
        (WebCore::EventHandler::eventActivatedView):
        (WebCore::EventHandler::handleDrag):
        (WebCore::EventHandler::handleMouseUp):
        (WebCore::EventHandler::mouseDown):
          Update to use DragController and PlatformMouseEvent

        * page/mac/WebCoreFrameBridge.h:
        * page/mac/WebCoreFrameBridge.mm:
        (-[WebCoreFrameBridge dragSourceMovedTo:]):
        (-[WebCoreFrameBridge dragSourceEndedAt:operation:]):
          Use DragController for state               

WebKit:
        Migrating methods to WebCore

        * WebCoreSupport/WebFrameBridge.mm:
        * WebView/WebHTMLView.mm:
        * WebView/WebHTMLViewPrivate.h:
                                         


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@19327 268f45cc-cd09-0410-ab3c-d52691b4dbfc