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This isolate will also be used by Cluster Telemetry to create isolate that contains perf code
without Chrome. So formalize its name to reflect the purpose.

Bug: skia:7796
Change-Id: I29566b047ab04b27def5e800f7174d1fd20b5db4
Reviewed-on: https://chromium-review.googlesource.com/1025131Reviewed-by: Emily Hanley <eyaich@chromium.org>
Reviewed-by: Ashley Enstad <ashleymarie@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#553421}