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This CL added the parsing logic for the new shard map with "sections", which allow stories from multiple index ranges from the same benchmark to run on the same shard.

The generated argument will be: --story-shard-indexes=<range_string>

Bug: chromium:1140389
Change-Id: Ifcd9fc16b6ec1be1ea20e0d68687b0d14b5d1f65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617002
Commit-Queue: Wenbin Zhang <wenbinzhang@google.com>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842777}