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Add benchmark.py. Runs build speed benchmarks on the current repository.

Example Command:
    tools/android/build_speed/benchmark.py all_incremental

Example Output:
    Summary
    gn args: target_os="android" use_goma=true android_fast_local_dev=true
    gn gen: 6.7s
    chrome_java_nosig: 36.1s avg (35.9s, 36.3s)
    chrome_java_sig: 38.9s avg (38.8s, 39.1s)
    chrome_java_res: 22.5s avg (22.5s, 22.4s)
    base_java_nosig: 41.0s avg (41.1s, 40.9s)
    base_java_sig: 93.1s avg (93.1s, 93.2s)

Bug: 1092528
Change-Id: I5840f99762edbaf6b7c7cc58b0f52b98051ed33c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2241643
Commit-Queue: Peter Wen <wnwen@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779877}