[Webkit-unassigned] [Bug 129551] New: Split UserActivity, simplify PageThrottler

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=129551

           Summary: Split UserActivity, simplify PageThrottler
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: barraclough at apple.com


The class UserActivity currently implements two things – a hysteresis mechanism, and an abstraction of NSActivity controlled by that mechanism. PageThrottler implements its own hysteresis mechanism, which directly controls DOM timer throttling and also controls a couple of UserActivities, giving a total of 3 separate hysteresis mechanisms, layered two deep.

Split UserActivity into three, with HysteresisActivity implementing an abstract hysteresis mechanism, UserActivity::Impl controlling the NSActivity, and then UserActivity combining these two back together. The interface to UserActivity is unchanged.

Remove PageThrottler's bespoke hysteresis, replacing it with a use of HysteresisActivity. Replace the two UserActivities with a single UserActivity::Impl, so there are no longer layered hysteresis mechanisms.

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