Set up view state before attaching, jump drawables if needed

View attachment calls jumpDrawablesToCurrentState(), so the view state
needs to be set up prior to attachment. For views that are already
attached but are being moved to a new position, manually jump.

Cleans up comments in methods that were modified.

Bug: 29978498
Change-Id: Ica27b2c60ad7ee98b9d1e4912c4f8b8c248af88d
(cherry picked from commit 26489e16)