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- Update trace file key to 'trace/1.json'. Per spec, key name should
  start with 'trace/' and extension should be '.json' since gtest
  output trace json.
- Update script test data as well;

Bug: 945711
Change-Id: I9fc36b154e68bae869f5221e243854847aaaf307
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899309
Auto-Submit: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Mikhail Khokhlov <khokhlov@google.com>
Cr-Commit-Position: refs/heads/master@{#712771}