Reviewed by Antti Koivisto.

        Fix for Bug 43704 - Web font is printed as blank if it is not cached
        https://bugs.webkit.org/show_bug.cgi?id=43704

        In setting printing, we should not validate resources already cached
        for the document. If we do, web fonts used for screen are revalidated
        and possiby reloaded. Then the fonts can be shown as blank on print.
        This patch won't save the case where screen and print use different web
        fonts. Nonetheless, this is an improvement.

        No new tests because there seems to be no good way to test print images.

        * editing/Editor.cpp:
        (WebCore::Editor::paste): Use ResourceCacheValidationSuppressor instead of explicitly allowing/disallowing stale resources.
        * loader/cache/CachedResourceLoader.h:
        (WebCore::ResourceCacheValidationSuppressor::ResourceCacheValidationSuppressor): RAII class for allowing/disallowing stale resources.
        (WebCore::ResourceCacheValidationSuppressor::~ResourceCacheValidationSuppressor):
        * page/DragController.cpp:
        (WebCore::DragController::concludeEditDrag): Use ResourceCacheValidationSuppressor instead of explicitly allowing/disallowing stale resources.
        * page/Frame.cpp:
        (WebCore::Frame::setPrinting): Use ResourceCacheValidationSuppressor to allow stale resources in printing.
2011-05-16  Yuzo Fujishima  <yuzo@google.com>

        Reviewed by Antti Koivisto.

        Fix for Bug 43704 - Web font is printed as blank if it is not cached
        https://bugs.webkit.org/show_bug.cgi?id=43704

        * WebView/WebHTMLView.mm:
        (-[WebHTMLView _setPrinting:minimumPageWidth:height:maximumPageWidth:adjustViewSize:paginateScreenContent:]): Use ResourceCacheValidationSuppressor to allow stale resources in printing.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@86601 268f45cc-cd09-0410-ab3c-d52691b4dbfc