Telemetry: Quiescent power benchmarks for Mac
Telemetry: Quiescent power benchmarks for Mac

Add benchmark and measurement for measuring quiescent power, and enable
it on Mac.
Moved the workaround for http://crbug.com/419786 so that we don't lose idle
wakeups numbers for the renderer process.

Review URL: https://codereview.chromium.org/1092393002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#326698}

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