https://bugs.webkit.org/show_bug.cgi?id=123045

Reviewed by Joseph Pecoraro.

Source/JavaScriptCore:

* jsc.cpp: Add function pointer for shouldInterruptScriptBeforeTimeout
to global method table.
* runtime/JSGlobalObject.cpp: Ditto.
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::shouldInterruptScriptBeforeTimeout): Added.

Source/WebCore:

* bindings/js/JSDOMWindowBase.cpp:
(WebCore::shouldInterruptScriptToPreventInfiniteRecursionWhenClosingPage): Added.
(WebCore::JSDOMWindowBase::shouldInterruptScript): Extracted comment and assertion
about null Page object into WebCore::shouldInterruptScriptToPreventInfiniteRecursionWhenClosingPage()
so that it can be shared by both this function and JSDOMWindowBase::shouldInterruptScriptBeforeTimeout().
(WebCore::JSDOMWindowBase::shouldInterruptScriptBeforeTimeout):
* bindings/js/JSDOMWindowBase.h:
* bindings/js/JSWorkerGlobalScopeBase.cpp:
(WebCore::JSWorkerGlobalScopeBase::shouldInterruptScriptBeforeTimeout): Added.
* bindings/js/JSWorkerGlobalScopeBase.h:
* loader/EmptyClients.h: Added isStopping(). We'll land the iOS chrome client implementation
in a subsequent patch.
* page/ChromeClient.h: Added isStopping().

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@157764 268f45cc-cd09-0410-ab3c-d52691b4dbfc