* Add theme attributes for specifying a top-level TransitionManager
for an activity window.
* Add window feature for automatic content transitions. This
automatically assigns/creates a Scene for setContentView calls.
* Add named transitions. This allows apps to define APIs for
handshake-agreements about which exit/entrance transitions to play.
* Add new transition type for ActivityOptions. This lets the system
use ActivityOptions to communicate transition specifics and
arguments to the called activity.
* Have ActivityManager pass appropriate ActivityOptions through to the
called Activity. Have the called activity call back into the caller
to let it know which transition of a possible requested set was
chosen.
Still to do:
* Define and pass arguments for transitions. This will require
defining a Parcelable version of TransitionValues and deciding how
much leeway apps should have for these things.
* Determine how to appropriately filter the ActivityOptions bundle so
that only appropriate data reaches the target.
* Determine if generalizing the auto-Scenes functionality to
ViewGroups is appropriate.
Change-Id: I10684b926129ab2fbc1adec9ef31767237acae79
cfbe9be5b3