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This change introduces the SystemRoutineController class that connects
to the cros_healthd DiagnosticsService. Subsequent CLs will declare and
implement a SystemRoutineController mojo interface.

Bug: 1128204
Change-Id: Ic510e1f90efedbbcba42827ca843323f04803e1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2457807Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816182}