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This patch adds install_time and last_launch_time fields to the Crostini
registry. These will be used in the app launcher's recently launched
apps list, where currently Crostini apps do not appear.

As we would also like the Terminal to appear in the recents list, this
patch makes the registry support the Terminal, returning it in both
GetRegistration and GetRegisteredAppIds. We don't need to keep track of
Terminal install time as it is just a fallback for apps that haven't
been launched. Internally, we only store the last launched time, so
methods in the registry need to be careful they don't expect all pref
entries will have all the standard fields.

Bug: 821662, 836137
Change-Id: I43f34434afe61bd80c165c3a42047b184f96fcbe
Reviewed-on: https://chromium-review.googlesource.com/1027292
Commit-Queue: Timothy Loh <timloh@chromium.org>
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553945}