GitLab

<rdar://problem/7593857> and https://bugs.webkit.org/show_bug.cgi?id=34444

Reviewed by Adele Peterson.

WebCore: 

Test: fast/loader/crash-copying-backforwardlist.html

* loader/FrameLoader.cpp:
(WebCore::FrameLoader::loadItem): Null check currentItem().

* page/Page.cpp:
(WebCore::Page::goToItem): Ditto.

WebKitTools: 

Add a mode (Mac-only for now) that exercises the WebView SPI _loadBackForwardListFromOtherView:

* DumpRenderTree/LayoutTestController.cpp:
(LayoutTestController::LayoutTestController):
(setNewWindowsCopyBackForwardListCallback):
(LayoutTestController::staticFunctions):

* DumpRenderTree/LayoutTestController.h:
(LayoutTestController::newWindowsCopyBackForwardList):
(LayoutTestController::setNewWindowsCopyBackForwardList):

* DumpRenderTree/mac/UIDelegate.mm:
(-[UIDelegate webView:createWebViewWithRequest:]):

LayoutTests: 

* fast/loader/crash-copying-backforwardlist-expected.txt: Added.
* fast/loader/crash-copying-backforwardlist.html: Added.
* platform/gtk/Skipped:
* platform/qt/Skipped:
* platform/win/Skipped:



git-svn-id: svn://svn.chromium.org/blink/trunk@54145 bbb929c8-8fbe-4397-9dbb-9b2b20218538