For every pipeline, we already show the number of items in the
pipeline in a "badge" after the pipeline name.
This change extends that concept to show the length of the
individual change queues in the same way -- a new badge to the right
of the queue name.
Additionally, in the case of dependent pipelines, we add the current
window size to the badge. So in check, a queue header might look like:
Queue: [17]
If there are 17 changes in the queue. And in gate it might look like:
Queue: integrated [4 / 22]
If there are 4 changes in the queue and the window size is 22.
The new badge has a tooltip that breaks each of these values out so
that users can discover their individual meanings. It looks like:
Queue length: 4
Window size: 22
Change-Id: I951e1b406926b2438a847874d64babee0d11fb6f
8021fdf37b