[Webkit-unassigned] [Bug 257443] New: RemoteLayerTreeDisplayRefreshMonitor::displayNominalFramesPerSecond returns the preferred frames per second

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=257443

            Bug ID: 257443
           Summary: RemoteLayerTreeDisplayRefreshMonitor::displayNominalFr
                    amesPerSecond returns the preferred frames per second
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mattwoodrow at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

displayNominalFramesPerSecond is intended to return the refresh rate of the display, but RemoteLayerTreeDisplayRefreshMonitor returns the preferred value set by the Page. This might be the nominal rate, but could also be a lower value if the Page applied throttling.

The only caller of this function is Page, so it's a circular dependency, that can't return any useful information.

I'm not aware of current bugs from this, but it seems plausible that we'd issue a windowScreenDidChange on iOS, and retrieve a throttled rate from the existing refresh monitor.

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