Reviewed by Alexey Proskuryakov.

        Bug 23618: Templated worker tasks should be more error proof to use.
        <https://bugs.webkit.org/show_bug.cgi?id=23618>

        Add the generic worker tasks templates needed for the WorkerThreadableLoader.

        No observable change in behavior, so no test.

        * GNUmakefile.am:
        * WebCore.pro:
        * WebCore.scons:
        * WebCore.vcproj/WebCore.vcproj:
        * WebCore.xcodeproj/project.pbxproj:
        * WebCoreSources.bkl:
        * dom/CrossThreadCopier.cpp: Added.
        * dom/CrossThreadCopier.h: Added.
        (WebCore::CrossThreadCopierPassThrough::copy):
        * dom/GenericWorkerTask.h:
        Stop doing the WorkerMessagingProxy::askedToTerminate call automatically
        in performTask because was not obvious that it would be done and not always needed.

        (WebCore::GenericWorkerTask1::create):
        (WebCore::GenericWorkerTask1::GenericWorkerTask1):
        (WebCore::GenericWorkerTask1::performTask):
        (WebCore::GenericWorkerTask2::create):
        (WebCore::GenericWorkerTask2::GenericWorkerTask2):
        (WebCore::GenericWorkerTask2::performTask):
        (WebCore::GenericWorkerTask3::create):
        (WebCore::GenericWorkerTask3::GenericWorkerTask3):
        (WebCore::GenericWorkerTask3::performTask):
        (WebCore::GenericWorkerTask4::create):
        (WebCore::GenericWorkerTask4::GenericWorkerTask4):
        (WebCore::GenericWorkerTask4::performTask):
        (WebCore::GenericWorkerTask5::create):
        (WebCore::GenericWorkerTask5::GenericWorkerTask5):
        (WebCore::GenericWorkerTask5::performTask):
        (WebCore::GenericWorkerTask6::create):
        (WebCore::GenericWorkerTask6::GenericWorkerTask6):
        (WebCore::GenericWorkerTask6::performTask):
        (WebCore::GenericWorkerTask7::create):
        (WebCore::GenericWorkerTask7::GenericWorkerTask7):
        (WebCore::GenericWorkerTask7::performTask):
        (WebCore::createCallbackTask):
        * dom/WorkerContext.cpp:
        (WebCore::addMessageTask):
        (WebCore::WorkerContext::addMessage):
        * dom/WorkerMessagingProxy.h:
        (WebCore::WorkerMessagingProxy::askedToTerminate):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@40525 268f45cc-cd09-0410-ab3c-d52691b4dbfc