commit 48c4b94a9d9eb0ae3a20ed9c05d9e77ff1a98b50
author yoshiki <yoshiki@chromium.org> Fri May 27 05:49:50 2016
committer Commit bot <commit-bot@chromium.org> Fri May 27 05:52:02 2016
tree c733f7d237c9d8a8b7c7e82d3c938c0d5999a295
parent 4743ab9d5ecd967717bcffe6e68063c0d81c1ff8

Show message center on lock screen

This patch does:
- Show the message center button on tray on the lock screen
- Show the message to encourage user to log in when user opens message center on lock screen
- Add SetLockedState(bool) and IsLockedState() method into MessageCenter class.
- Don't make notifications read when opening the message center on lock screen
- Add tests

And this patch also fixes the bug that this makes blocked notifications read wrongly.

BUG=599891
TEST=manually tested

Review-Url: https://codereview.chromium.org/1986493002
Cr-Commit-Position: refs/heads/master@{#396402}