Bug 21781: WebCore::Settings should have a maximum decoded image size setting

    Bug 21781: WebCore::Settings should have a maximum decoded image size setting

        <https://bugs.webkit.org/show_bug.cgi?id=21781>

        Reviewed by Antti.

        No tests since there is no change in behavior.

        * loader/CachedImage.cpp:
        (WebCore::CachedImage::maximumDecodedImageSize): Added.  Returns
        WebCore::Settings::maximumDecodedImageSize() or 0 on error.
        (WebCore::CachedImage::data): Flag an error if the image being
        loaded is too big.
        * loader/CachedImage.h:
        (WebCore::CachedImage::maximumDecodedImageSize): Added declaration.
        * page/Settings.cpp:
        (WebCore::Settings::Settings): Initialize m_maximumDecodedImageSize
        to the maximum value of size_t.
        * page/Settings.h:
        (WebCore::Settings::setMaximumDecodedImageSize): Added method.
        (WebCore::Settings::maximumDecodedImageSize): Ditto.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@37803 268f45cc-cd09-0410-ab3c-d52691b4dbfc