GitLab

- Takes a list of routines and runs them sequentially using the mojo
  interface SystemRoutineController

Bug: 1125150
Test: browser_tests --gtest_filter=DiagnosticsApp*
Change-Id: Ia535db169eb141d611ecf94cd600a0e6920339b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2464072Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Commit-Queue: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816376}