https://bugs.webkit.org/show_bug.cgi?id=22066
        Implement Worker global object

        * DerivedSources.make: Added WorkerLocation IDL and JSWorkerContext lookup table.

        * WebCore.xcodeproj/project.pbxproj: Only adding files to Mac project for now, as Worker
        support is still disabled by default.

        * bindings/js/JSDOMGlobalObject.cpp: (WebCore::toJSDOMGlobalObject): Implemented Worker case.

        * bindings/js/JSMessageChannelConstructor.cpp:
        (WebCore::JSMessageChannelConstructor::JSMessageChannelConstructor): Ditto.

        * bindings/js/JSWorkerContext.cpp: Added.
        * bindings/js/JSWorkerContext.h: Added.
        * bindings/js/WorkerScriptController.cpp: Added.
        * bindings/js/WorkerScriptController.h: Added.
        * dom/WorkerContext.cpp: Added.
        * dom/WorkerContext.h: Added.
        Added an implementation of worker contexts.

        * dom/DedicatedWorker.cpp:
        (WebCore::DedicatedWorker::startLoad): Fixed a lifetime bug I saw on my tests.
        (WebCore::DedicatedWorker::notifyFinished): Create a thread. Currently, object ownership
        and lifetime is not clear at all.

        * dom/WorkerLocation.cpp: Added.
        * dom/WorkerLocation.h: Added.
        * dom/WorkerLocation.idl: Added.
        Added WorkerLocation, which is one of the objects available to workers.

        * dom/WorkerThread.cpp: Added.
        (WebCore::WorkerThread::WorkerThread):
        (WebCore::WorkerThread::start):
        (WebCore::WorkerThread::workerThreadStart):
        (WebCore::WorkerThread::workerThread):
        * dom/WorkerThread.h: Added.
        (WebCore::WorkerThread::create):
        Run some code in a worker thread (no message loop yet).



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@38150 268f45cc-cd09-0410-ab3c-d52691b4dbfc