Changes in 20200816094524

Built from 01c8bc283e34f95f3550eb0641a3c82fdef7c443

..index..
Bug 1658649 R[Core:DOM: Navigation]Make session-history-in-parent nsISHEntry setters to rely on active entry
Bug 1658454 R[Core:DOM: Navigation]nsISHEntry.cacheKey setter for session-history-in-parent
Bug 1659215 R[Core:Disability Access APIs]Expose previously slow text attributes
Bug 1659274 R[Core:Graphics: WebRender]Silence build warnings in SWGL linear_composite
Bug 1655766 R[Core:JavaScript Engine: JIT]Optimise Object.is in CacheIR and Warp
Bug 1659065 R[Core:JavaScript: GC]WeakRef trace hook unnecessarily triggers barriers
Bug 1659249 A[Core:Layout: Grid]grid-intrinsic-track-sizes-001.html causing forbidden external connection wpt.live
Bug 1656223 R[Core:Panning and Zooming]iview.abc.net.au videos zoomed after exiting fullscreen
Bug 1658455 R[Core:SVG]Remove eANIMATION and eFILTER from IsNodeOfType
Bug 1656062 R[Toolkit:Printing]Implement loading interstitial state for print UI
Bug 1658043 R[Toolkit:Printing]Support Save to PDF in print preview
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Changes to 11 bugs - 10 fixed.