2008-06-30 Anders Carlsson <andersca@apple.com>

2008-06-30  Anders Carlsson  <andersca@apple.com>

        Reviewed by Adam.

        Add PluginMainThreadScheduler, a singleton which is responsible for scheduling plug-in
        callbacks on the main thread. Use this to implement NPN_PluginThreadAsyncCall on Windows.

        * WebCore.vcproj/WebCore.vcproj:
        Add PluginMainThreadScheduler.{cpp|h}

        * plugins/PluginMainThreadScheduler.cpp: Added.
        * plugins/PluginMainThreadScheduler.h: Added.

        * plugins/PluginView.cpp:
        (WebCore::PluginView::start):
        Register with the thread scheduler.

        * plugins/npapi.cpp:
        (NPN_PluginThreadAsyncCall):
        Call the thread scheduler.

        * plugins/win/PluginPackageWin.cpp:
        (WebCore::PluginPackage::load):
        Initialize the NPN_PluginThreadAsyncCall callback.

        * plugins/win/PluginViewWin.cpp:
        (WebCore::PluginView::stop):
        Unregister with the scheduler. This makes sure that we won't try to deliver callbacks
        after the plug-in has been destroyed.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@34926 268f45cc-cd09-0410-ab3c-d52691b4dbfc