Tests for fix back stack problems due to postponed transitions

Bug 38277003

The back stack was being moved while executing operations and
then again when the postponed transaction was executed. It should
only be done once.

Framework Change: I3b7a032e7e8a9aec565157d42dcaa7232b256ae8
Test: ran fragment tests

Change-Id: Ie47e1f2f158325b9cfd6edb5c40c65d764ff9056
1 file changed