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        Reviewed by Adam Barth.

        Stop preload scanning CSS when it's impossible to have another @import.
        https://bugs.webkit.org/show_bug.cgi?id=57664

        * fast/preloader/style-expected.txt:
        * fast/preloader/style.html: Updated to test invalid @import statements.
2011-04-05  James Simonsen  <simonjam@chromium.org>

        Reviewed by Adam Barth.

        Stop preload scanning CSS when it&apos;s impossible to have another @import.
        https://bugs.webkit.org/show_bug.cgi?id=57664

        @import statements are only allowed at the beginning of a CSS file.
        Only comments or @charset can precede them. After seeing anything else,
        abort early so that we:
        - don't have to parse the rest of the CSS.
        - don't preload something that the regular parser won't load.

        * html/parser/CSSPreloadScanner.cpp:
        (WebCore::CSSPreloadScanner::scan): Terminate early if we're done with @imports.
        (WebCore::CSSPreloadScanner::tokenize): Terminate early if we see a {} or any style rule.
        (WebCore::CSSPreloadScanner::emitRule): Only @charset or @import are allowed to precede @import.
        * html/parser/CSSPreloadScanner.h: Add DoneParsingImportRules state.

git-svn-id: svn://svn.chromium.org/blink/trunk@82916 bbb929c8-8fbe-4397-9dbb-9b2b20218538