[Webkit-unassigned] [Bug 117462] New: Fix RenderLayer::collectLayers logic bug

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=117462

           Summary: Fix RenderLayer::collectLayers logic bug
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: hyatt at apple.com, simon.fraser at apple.com,
                    dino at apple.com


Consider merging https://chromium.googlesource.com/chromium/blink/+/3dfbb71ed8eefeca1618b85c72b912c051314836

In collectLayers, if a layer is normal flow only, we will not add it
to the z-order lists. The trouble is that
RenderLayer::shouldBeNormalFlowOnly depends on 
RenderLayer::needsCompositedScrolling. This means that the result of
collectLayers depends on the opt-in decision of other layers,
something which must not happen: when we are determining opt-in, we
must never depend on the opt-in decision for another layer. This CL
makes this function opt-in agnostic when it needs to be.

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