Adjustments to expanded view size and position

* Previously on large screens the expanded view was centered on the
  screen now it will be anchored to whichever edge it was expanded on
  ONLY when in landscape on a large large screen. In portrait, and on
  "small tablets" it will continue to be centered.
* Updates the width of the expanded view on portrait and on landscape
  for large screens.
* Adds the notion of small tablet

Test: manual - Open a bubble in various configurations:
      1) on phone:
        * landscape => bubbles show vertically on the side they were
          expanded on and expanded view is centered horizontally
        * portrait => bubbles show on top, expanded view centered
          horizontally
      2) on tablet that isn't small:
        * landscape => bubbles show vertically on the side they were
          expanded on and the expanded view is anchored to that edge
          with some padding
        * portrait => bubbles show vertically on the side they were
          expanded on and expanded view is centered horizontally
      3) on small tablet:
        * portrait & landscape => bubbles show vertically on the side
          they were expanded on and the expanded view is centered
          horizontally and takes up more space %-wise compared to a
          large tablet
Bug: 217211205
Change-Id: I7259e03aab35e0039c9b7bd855c12afe38373ace