[Webkit-unassigned] [Bug 191833] New: Avoid potential longer than expected layer flush delays

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191833

            Bug ID: 191833
           Summary: Avoid potential longer than expected layer flush
                    delays
           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: koivisto at iki.fi
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Layer flush throttling also stops style recalcs and layouts. Layouts schedule layer flushes. Especially on a slow network we can in principle end up in situation where layer flush timer fires but there is no flush scheduled and so nothing happens. However there is a pending style recalc or layout that would actually schedule a flush (in practice various things force style recalcs and this doesn't occur commonly).

To avoid this we should flush unconditionally when the flush timer fires. This performs any pending style recalc and layout too. If there is nothing to do the flush will be cheap.

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