Robert Sesek 6d829e9af7 Create WorkerThread, an abstraction to perform some work on an interval.
This was extracted from CrashReportUploadThread and will be re-used for the
database pruning thread.

BUG=crashpad:22
R=mark@chromium.org

Review URL: https://codereview.chromium.org/1526563003 .
2016-01-04 17:10:58 -05:00
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