Initial checkin of media test matrix class, which will be used for media perf test later.

third_party/APScheduler/README.txt

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+Advanced Python Scheduler (apscheduler) is a light but powerful in-process task
+scheduler that lets you schedule functions (or any python callables) to be
+executed at times of your choosing.
+
+The development of apscheduler was heavily influenced by the `Quartz
+<http://www.opensymphony.com/quartz/>`_ task scheduler written in Java,
+although APScheduler cannot claim as many features.
+
+
+Features
+========
+
+* No external dependencies
+* Thread-safe API
+* Cron-like scheduling
+* Delayed scheduling of single fire jobs (like the UNIX "at" command)
+* Interval-based scheduling of jobs, with configurable start date and
+  repeat count
+
+
+Documentation
+=============
+
+Documentation can be found on the `APScheduler site
+<http://packages.python.org/APScheduler/>`_.
+
+
+Source
+======
+
+The source can be browsed at `Bitbucket
+<http://bitbucket.org/agronholm/apscheduler/src/>`_.