Use ArrayMap instead of HashMap in transitions

Use ArrayMap instead of HashMap in transitions

The new ArrayMap class is more efficient for small collections.
Transitions use maps all over the place to collect/use property
values in setting up the transition animations. Changing to ArrayMap
should be more efficient, especially in terms of memory allocations
and GCs.

Issue #9276256 Transitions: Reduce memory allocations

Change-Id: I07b7d4ba68d5a207808eca11943aa3578fa90e3e