[Webkit-unassigned] [Bug 77867] New: Decrease total memory usage of CSSStyleSelector::appendAuthorStylesheets

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=77867

           Summary: Decrease total memory usage of
                    CSSStyleSelector::appendAuthorStylesheets
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: zoltan at webkit.org
                CC: koivisto at iki.fi


CSSStyleSelector::appendAuthorStylesheets was introduced in r104060 bug #75508
I was investigating total memory usage with Freya tool (http://webkit.sed.hu/blog/20091127/new-tool-extract-meaningful-memory-consumption-values-valgrind-shines-again) and I found that calling Vector's shrinkToFit method generates a lot of memory usage. 
shrinkToFit function call of appendAuthorStylesheets is accountable for 5.6 megabytes total memory allocation while it has only 452 kbytes peak.
My question: is it necessary to call shrinkToFit in appendAuthorStylesheets? If it is then do you have any idea about a lazy-calling way?

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