[Webkit-unassigned] [Bug 84391] New: Set m_compositingDependsOnGeometry to false if possible

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=84391

           Summary: Set m_compositingDependsOnGeometry to false if
                    possible
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: simon.fraser at apple.com
                CC: vangelis at chromium.org, enne at google.com


RenderLayerCompositor sets the m_compositingDependsOnGeometry flag if it needs to wait until after layout is done before making compositing decisions. This is used for iframes and plugins.

m_compositingNeedsUpdate was added for fixed position, but I think plays a similar role.

Also, m_compositingDependsOnGeometry is never set to 'false' after being set, so we end up doing expensive computeCompositingRequirements() checks every time.

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