commit 8e3fd7676023738c04d099f2940a635ff0699717
author Ben Kwa <kenobi@google.com> Thu Dec 17 10:37:00 2015 -0800
committer Ben Kwa <kenobi@google.com> Mon Dec 21 15:31:15 2015 -0800
tree 27892fa13adf894585190d60b6366ed7369ed25e
parent 6280de03bdccac678c1e4440de5a7fa1818988d9

Refactor DocumentHolder.

Primary goals of this refactor are to reduce DirectoryFragment bloat,
and to simplify the code (especially the binding code) for the different
layouts.

- Decouple DocumentHolder from DirectoryFragment.
- Move it into its own file.
- Move binding code from DirectoryFragment into DocumentHolder.
- Split DocumentHolder implementation into three separate subclasses,
  for grid items, list items, and dividers.

BUG=24326989

Change-Id: I217bf4e5b8e1b33173b8b0275591a8c5d8e9161c