tree 36d64f4bd42aa668cf40c4062089ddc9dcb92b6e
parent 40c7d78e816e916d1a70fa35cbeccd9c4996a3cf
author David Murphy <dave.murphy@gmail.com> 1560213640 +0000
committer David Murphy <djmurphy@google.com> 1560213640 +0000

[story_shell] naive implementation of original layout layout_logic

Adds the original story shell layout logic to composition_delegate:

* Surfaces with co-present relationships try to get laid out next to
  each other/.
* Surfaces with sequential relationships start a break and are shown by
  themselves on a new 'screen'
* As many surfaces as are in the focus stack are laid back on as many
  layers as required - it's up to the Presenter what to do with those

Missing from this implementation:
* Emphasis - always a strange expression, might deprecate if we can get
  reliable mod preference expression via e.g. manifest or context.
* Dependency - todo

Tests: fx run-host-tests composition_delegate_tests

Change-Id: Ic0908676c1a790113584b1426ebcfc2534e47b29