JavaScriptCore:

        Add support for setting thread names on Windows

        These thread names make it much easier to identify particular threads
        in Visual Studio's Threads panel.

        WTF::createThread now takes a const char* representing the thread's
        name. On Windows, we throw a special exception to set this string as
        the thread's name. Other platforms do nothing with this name for now.

        Reviewed by Anders Carlsson.

        * JavaScriptCore.exp: Export the new version of createThread that
        takes 3 arguments (the old one continues to be exported for backward
        compatibility).
        * wtf/Threading.h: Add a threadName argument to createThread.

        * wtf/ThreadingGtk.cpp:
        (WTF::createThread):
        * wtf/ThreadingNone.cpp:
        (WTF::createThread):
        Updated for function signature change.

        * wtf/ThreadingPthreads.cpp:
        (WTF::createThread): Updated for function signature change. We keep
        around the old 2-argument version of createThread for backward
        compatibility.

        * wtf/ThreadingWin.cpp:
        (WTF::setThreadName): Added. This function's implementation came from
        MSDN.
        (WTF::initializeThreading): Set the name of the main thread.
        (WTF::createThread): Call setThreadName. We keep around the old
        2-argument version of createThread for backward compatibility.

WebCore:

        Add names for WebCore's threads

        Reviewed by Anders Carlsson.

        * loader/icon/IconDatabase.cpp:
        (WebCore::IconDatabase::open):
        * storage/DatabaseThread.cpp:
        (WebCore::DatabaseThread::start):
        * storage/LocalStorageThread.cpp:
        (WebCore::LocalStorageThread::start):
        Pass in names to createThread.

        * platform/network/cf/ResourceHandleCFNet.cpp:
        (WebCore::runLoaderThread):
        (WebCore::ResourceHandle::loaderRunLoop):
        Changed to use WTF::createThread.

WebKit/win:

        Export the new version of createThread

        Reviewed by Anders Carlsson.

        * WebKit.vcproj/WebKit.def:
        * WebKit.vcproj/WebKit_debug.def:
        Also moved the old version of createThread into the deprecated
        section.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@35419 268f45cc-cd09-0410-ab3c-d52691b4dbfc