Delay clock size computation

Delaying the clock size computation appears to allow the notification
flows to catch up. Since the clock size computation can evidently be
triggerred prior to the underlying data sources being updated, this
causes us to recompute the old value, and then miss when we should've
computed the new value.

Delaying the computation of clock size one frame by posting it to the
view's handler appears to correct that issue by delaying the computation
until after the data source has recieved it's update.

Bug: 423637687
Flag: NONE - Bugfix in NPVC
Test: Checked function of clock switch animation
Change-Id: I6192db3c973fd8a71796c0f9b84581fc65ed6cd2