[Webkit-unassigned] [Bug 173584] New: focus() function in Speedometer 2.0 Inferno takes long time because of repetitive frame->layout()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=173584

            Bug ID: 173584
           Summary: focus() function in Speedometer 2.0 Inferno takes long
                    time because of repetitive frame->layout()
           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: utatane.tea at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Looking the sampling profiler result of Speedometer 2.0, I found that super large part of Inferno test just executes focus() function in deleting test(sync delete test).
https://perf.webkit.org/v3/#/charts?since=1496638276950&paneList=((18-895))

And it seems that focus() in this test repeatedly falls into frame->layout().

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