[meta] Servo blockers

[fabricedesre]

These are Servo issues that are blocking servonk one way or the other from being awesome:

• Flex layout is not updated on window resize servo/servo#20822 : Flex layout is not updated on window resize. That prevents the layout of the status and navbars to update properly on window resize.
• The Idle state is not always reached at the end of css transitions servo/servo#20379 : The Idle state is not always reached at the end of css transitions. Many animations are disabled because of that bug.
• Keyframe animations are not stopped/removed properly servo/servo#20731 : Keyframe animations are not stopped/removed properly. That is preventing us from using keyframe animations without using a crazy amount of cpu.
• Add a ThemeColorChanged embedder message servo/servo#20660 : Add a ThemeColorChanged embedder message. Needed to implement ambient themeing.
• The :active pseudo class is not (fully) supported servo/servo#20284 : The :active pseudo class is not (fully) supported. That forces us to manually set classes on tapped elements to eg. change the background color (see the lockscreen code).
• Full page flexbox layout doesn't fill the page servo/servo#20111 : Full page flexbox layout doesn't fill the page. Maybe we could have a simpler page layout if that worked.
• Make android OSes use the unix module instead of inprocess servo/ipc-channel#143 : Make android OSes use the unix module instead of inprocess. This blocks multiprocess on Gonk.
• Implement BroadcastChannel servo/servo#21025 : BroadcastChannel could be used as a message bus for the default apps.
• Implement composition* event servo/servo#20770 : composition events are needed for the virtual keyboard.

[gterzian]

The BroadcastChannel part is now done...