Fix bootstraps_deps of tools/perf to include build/android/pylib/.
Fix bootstraps_deps of tools/perf to include build/android/pylib/.

After John's work in crbug.com/560559, telemetry project no longer depends
on pylib, hence tools/perf which is a user of telemetry must specify this
deps explictly.

BUG=572700, 560559
TBR=jbudorick@chromium.org

Review URL: https://codereview.chromium.org/1556463002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#367045}

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