Cluster Telemetry

The high level documentation is here: https://skia.org/dev/testing/ct

Documentation for running telemetry benchmarks with Chromium/Skia/Blink patches on top10k is here: https://www.chromium.org/developers/cluster-telemetry

Documentation for running render_pictures with Skia patch on top10k is here: https://docs.google.com/document/d/1gNiy7DMa7Y4ib8XqcAcO0UeWL2a3ts2hYacE9TTg02M/edit