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