https://bugs.webkit.org/show_bug.cgi?id=22053
        
        This patch adds initial support for the NPDrawingModelCoreAnimation drawing model. 
                
        * Plugins/WebBaseNetscapePluginView.h: Added _layer ivar.
        * Plugins/WebBaseNetscapePluginView.mm:
        (-[WebBaseNetscapePluginView saveAndSetNewPortStateForUpdate:]): ASSERT this is not a plug-in using NPDrawingModelCoreAnimation.
        (-[WebBaseNetscapePluginView restorePortState:]): Ditto.
        (-[WebBaseNetscapePluginView sendEvent:isDrawRect:]): Slightly refactored a small block of code which with the PortState.
        Plug-ins using the NPDrawingModelCoreAnimation drawing model have no PortState. 
        (-[WebBaseNetscapePluginView isNewWindowEqualToOldWindow]): ASSERT this is not a plug-in using NPDrawingModelCoreAnimation
        (-[WebBaseNetscapePluginView updateAndSetWindow]):  Ditto.
        (-[WebBaseNetscapePluginView setWindowIfNecessary]): Ditto.
        (-[WebBaseNetscapePluginView start]): If the plug-in is a plug-in using the Core Animation model, request a layer from it.
        (-[WebBaseNetscapePluginView drawRect:]): Return early for NPDrawingModelCoreAnimation plug-ins.
        (-[WebBaseNetscapePluginView getVariable:value:]): Tell plug-ins running on post-Tiger systems WebKit supports
         NPDrawingModelCoreAnimation.
        (-[WebBaseNetscapePluginView setVariable:value:]): Added the new NPDrawingModelCoreAnimation case, which initializes drawingMode.
        (-[WebBaseNetscapePluginView _viewHasMoved]): Reworded the conditional call to updateAndSetWindow to be specific to 
        CoreGraphics and QuickDraw plug-ins.

        Reviewed by Anders Carlsson.

        https://bugs.webkit.org/show_bug.cgi?id=22053

        Added additional support needed for the NPDrawingModelCoreAnimation drawing model. 

        * bridge/npapi.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@38078 268f45cc-cd09-0410-ab3c-d52691b4dbfc