WebKit now gets called when render_frame subviews are added.

        * khtml/rendering/render_frames.cpp:
        (RenderPart::setWidget): call didAddWidget on the part
        * kwq/KWQKHTMLPartImpl.h:
        * kwq/KWQKHTMLPartImpl.mm:
        (KWQKHTMLPartImpl::didAddWidget): added, calls didAddSubview on the bridge

WebKit:

	Support for new plug-in API. This is about as much as I can do without the new java plug-in and java root.

        * Plugins.subproj/WebPluginController.h:
        * Plugins.subproj/WebPluginController.m:
        (-[WebPluginController initWithWebFrame:]): observe window close changes
        (-[WebPluginController dealloc]): remove observer, assert if we're still tracking plug-ins
        (-[WebPluginController didAddSubview:]): start the plug-in
        (-[WebPluginController stopAllPlugins]): stop and destroy all plug-ins.
        (-[WebPluginController windowWillClose:]): call stopAllPlugins if the window in question is closing
        * WebView.subproj/WebFramePrivate.m:
        (-[WebFrame _transitionToCommitted]): call stopAllPlugins on WebPluginController


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@2442 268f45cc-cd09-0410-ab3c-d52691b4dbfc