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This change introduces the SystemRoutineController Mojo interface
which will be used by the Diagnostics SWA to run various diagnostic
routines. The first such routine is the CPU Stress Test.

An example of the CPU routines being called from the app can be seen
enumerated here[1] and executed here[2]

1- https://source.chromium.org/chromium/chromium/src/+/master:chromeos/components/diagnostics_ui/resources/cpu_card.js;drc=28198c08d1153532dbf1375412fc6fa42de320d7;l=37
2 -https://source.chromium.org/chromium/chromium/src/+/master:chromeos/components/diagnostics_ui/resources/routine_list_executor.js;l=88-118


Bug: 1128204
Change-Id: I3662f91d72e86b03e3b40436bbf7a0a9204351ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2457926
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823339}