[Webkit-unassigned] [Bug 36399] New: WorkerScriptLoader always (and unfortunately sometimes) inherits caching policy from the parent context.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=36399

           Summary: WorkerScriptLoader always (and unfortunately
                    sometimes) inherits caching policy from the parent
                    context.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore JavaScript
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: dimich at chromium.org
                CC: ap at webkit.org, levin at chromium.org,
                    atwilson at chromium.org


Probably since we switched from using CachedScript to ThreadableLoader in
WorkerScriptLoader (http://trac.webkit.org/changeset/44726), the caching
behavior changed in somewhat unfortunate way: when the page that creates more
then 1 worker from the same script is "reloaded", it re-validates all the
resources via server roundtrip and if multiple workers are created from the
same url, they get revalidated every time.

Here is the test created by Drew Wilson:
http://www.corp.google.com/~atwilson/worker-latency.html

Click the link, it'll create several workers. Note the printed time. Hit
refresh. It'll create several workers again, this time taking longer for each
one, for roundtrip to the server.

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