Changes in 20200224094751

Built from 28418b02132f1db7d9214f7cb77735fe85bb76cf

..index..
Bug 1614958 N[Core:Audio/Video: Playback]Disable VP9 support on Android devices without hardware decoder.
Bug 1519519 R[Core:CSS Parsing and Computation][css-values] support CSS min() / max() / clamp() functions.
Bug 1617425 R[Core:CSS Parsing and Computation]Use cbindgen for SVG lengths.
Bug 1617421 R[Core:CSS Parsing and Computation]Use cbindgen for cursors
Bug 1617069 R[Core:CSS Parsing and Computation]Minor LengthPercentage improvements.
Bug 1617326 R[Core:Canvas: WebGL]Failures in 2.0.1 conformance2/extensions
Bug 1609475 R[Core:DOM: Navigation]Regression when navigating multiple subframes through history simultaneously
Bug 1614847 R[Core:DOM: Navigation]tabs.update with {loadReplace: true} on tabs with moz-extension URLs broken in Firefox 74
Bug 1615967 R[Core:DOM: Navigation]Move nsIDocShell::customUserAgent onto BrowsingContext
Bug 1616147 R[Core:Layout]bump layout telemetry expiry
Bug 1616798 R[Core:Layout: Text and Fonts]Crash in [@ IPC::ParamTraits<nsTArray<T> >::Write]
Bug 1610171 R[Core:SVG]firefox does not render correctly SVG animations
Bug 1617415 R[Core:String]Remove nsTSubstring<T>::ReplaceASCII
Bug 1616994 A[Core:Web Painting]Merge layout/reftests/backgrounds/gradient and layout/reftests/css-gradients
Bug 1615462 R[Core:WebVR]VRParent.cpp: missing unistd include for getpid
Bug 1615270 R[Core:Widget: Gtk][Media-Control Linux] MPRIS: Controller interface doesn't change UI correctly
Bug 1617193 R[Firefox:Search]eBay should only be offered on select en-US regions for modern configuration
Bug 1617437 N[Firefox Build System:Source Code Analysis]Fails to build with [-Werror,-Wnon-c-typedef-for-linkage]
Bug 1617324 R[GeckoView:General]non-e10s busted in GeckoView
###########
Changes to 19 bugs - 16 fixed.