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Fixes run_performance_tests.py causing the merge script to blow up in
cases where a gtest-based perf test is run on multiple shards. This
was caused by the script outputting a summary to JSON instead of
per-test results, which caused the merge script to try to merge the
identically named tests.

This is worked around by appending the shard number to the end of the
name, but a proper fix where all test results are reported should still
be implemented.

Bug: 1115658
Change-Id: I55aa3d6c2ce2a4ae681fdcc2338e5016ec478866
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2351386
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797838}