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This CL supplies two command-line flags that are necessary to compute
the proxy power metric (based on CPU usage and power profiles).

 * --fetch-power-profile downloads the power profile from the cloud.

 * --performance-mode=keep disables the Telemetry power management,
 making it possible to collect cpu_freq events. Note that there will
 likely be a drop in observed power rails metrics after this CL lands,
 because devices will use more efficient CPU scheduling policy.

Change-Id: I9aeecd80cda1a883e1994ba70b0a439cd83f8749
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2566995Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
Cr-Commit-Position: refs/heads/master@{#832770}