Return the last access time of apps to QSB.

When we get a request for results from global search, results will be
sorted by last access time, and the new field
SearchManager.SUGGEST_COLUMN_LAST_ACCESS_HINT will be set.

The launch times are no longer updated every 6 hours. Now we
update the in-memory database when the request from QSB sets a
"refresh" parameter.

DEPENDS ON: I80e9b127410ed0d528515d2256787f30a953e9b0

Change-Id: Ie45e4fa52ffe43d4e7f3fa06221f3c9e039f2bb1
4 files changed