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This benchmark is run on content-shell only, but we don't have content-shell 
in our perf waterfall, so this isn't actually run anywhere.

For local run, we can just do:
./tools/perf/run_benchmark blink_perf --test-path=BlinkGc

BUG=575762

Change-Id: I2255322b6c5c12ee23bc812264bf4c73450d3e1f
Reviewed-on: https://chromium-review.googlesource.com/516522
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#474968}