Extra logging related to widget removal upon restore

As observed in b/187799223, widgets are removed after restore. We cannot
identify the root cause from the bugreport. This CL includes more
logging in the hope of identifying the root cause.

Bug: 18779922
Bug: 190565858
Test: manual
Change-Id: Ibdc9876716028592d17beac4542e1d8c498f9e4c
(cherry picked from commit 655ac082)