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This CL added a argument for process_perf_results to allow skipping upload
the results to perf dashboard. It is needed in the future when tester will
skip the uploading step.

Bug: chromium:1045256
Change-Id: I505dcf5625a193d030b44924f51fb51738a678a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2113804Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Wenbin Zhang <wenbinzhang@google.com>
Cr-Commit-Position: refs/heads/master@{#753158}