2009-06-19  Alice Liu  <alice.liu@apple.com>

        Fix https://bugs.webkit.org/show_bug.cgi?id=26568 
        Repro crash animating GIF if previously used in a closed window's back/forward list
        Also filed as <rdar://problem/6978362>

        Reviewed by Maciej Stachowiak.

        Can't test this bug with an automated layout test since it requires b/f caching 
        * manual-tests/animated-gif-bfcache-crash.html: Added.
        * manual-tests/resources/containsAnimatedGif.html: Added.

        Adding checks for hostWindow() since there is no guarantee that the Page is alive
        * platform/ScrollView.cpp:
        (WebCore::ScrollView::scrollRectIntoViewRecursively):
        (WebCore::ScrollView::contentsToScreen):
        (WebCore::ScrollView::screenToContents):
        (WebCore::ScrollView::wheelEvent):

LayoutTests:

2009-06-19  Alice Liu  <alice.liu@apple.com>

        Fix https://bugs.webkit.org/show_bug.cgi?id=26568 
        Repro crash animating GIF if previously used in a closed window's back/forward list
        Also filed as <rdar://problem/6978362>

        Reviewed by Maciej Stachowiak.

        Adding resource used in WebCore/manual-tests/animated-gif-bfcache-crash.html
        * http/tests/misc/resources/animated-gif-with-offsets.gif: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@44908 268f45cc-cd09-0410-ab3c-d52691b4dbfc