Improve hostside test for App window resize

The case of an Activity resizing from fullscreen to docked
is currently tested and verified that some key properties are
being correctly updated (Display, Configuration).

This change adds the reverse case, where the Activity starts in
docked mode and transitions to fullscreen.

Bug:28388969
Change-Id: I9b7d37a5250af36e9255a57d873717251d72cc9e
2 files changed