On phone we use 60% of the screen which is huge on
tablet. This change uses 30% of the screen for the
flyout on large screens & enforces a minimum for
that value.
Test: manual - get a long message in a bubble on a
tablet, it should have similar width
as it does on phone.
Bug: 186776550
Change-Id: I500c566edd9941dc2bd149692eaf95c6e6f4aa61
3289ae9f64