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We want to be able to import from core module in tools/perf without
bringing the whole of Telemetry as a dependency.

As a first step, for scripts that really need it we add near the
top:

    from core import path_util
    path_util.AddTelemetryToPath()

Alternatively, top level benchmark runner scripts can just import:

    from chrome_telemetry_build import chromium_config

which *will* implicitly add to sys.path Telemetry and all its
required dependencies.

The implicit dependency to Telemetry in "core" will be removed on a
follow up CL.

Bug: 981349
Change-Id: I900366d1849341d079b45ae4201a2c6e9d1c9044
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1760218Reviewed-by: Paul Jensen <pauljensen@chromium.org>
Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688463}