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This harness contains the APIs necessary for all press benchmarks, but
they will remain separate benchmarks.  There is just now common
functionality that they can gain from this harness.

This CL includes:
1) New press benchmark that enables both in test javascript metrics
as well as tracing metrics
2) New press pages that implements the new measurement
3) Converted speedometer, speedometer2, and dromaeo benchmarks

Bug: 714231
Change-Id: I487612d38f06ecd8a4c8905102972b134497d0c0
Reviewed-on: https://chromium-review.googlesource.com/c/1299739
Commit-Queue: Emily Hanley <eyaich@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#605349}