tree 099139bd2c436c9524b5982e26012eb70fabb742
parent 1a7e27bc5322db7763002364ecebbd3369cc614e
author Ben Kwa <kenobi@google.com> 1453837803 -0800
committer Ben Kwa <kenobi@google.com> 1453846542 -0800

Add MetricsLogger calls to DocumentsUI.

- Create new categories in MetricsLogger for DocumentsUI events.
- Add logging code to DocumentsUI for launch events and viewing roots.

BUG=26737132

Change-Id: Ib703878a39dd03b57e68a4d5a1d6cf8fe2936c5a