Restrict the space bubbles are centered in while in landscape

Restrict the space bubbles are centered in while in landscape

In landscape don't use the full screen width, instead, restrict to a
percentage of the screen & enforce a minimum of the width of the screen.

* Updates the displaySize passed to ExpandedAnimationController
  to be the "real size", this is consistent with what BubbleExpandedView
  uses now
* Alters positioning calculations in ExpandedAnimationController &
  accounts for notches / screen decorations

Test: manual - have multiple bubbles
             - expand the stack
             - rotate the device
             => observe that the bubbles look nicely centered (i.e. not
                too much space or too little space) in landscape & portrait
Bug: 135487618
Change-Id: Ief7fc6f762f8cc130e37963d48005f15a1bea743