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This CL changes the run_gtest_perf_test.py script to output well formed
test results json.

Bug: 855234
Change-Id: Ia5ce6e258865e34a2aa37635c014cd54efa62796
Reviewed-on: https://chromium-review.googlesource.com/1112635
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570943}