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This CL introduce a benchmark (based on flim@'s work),
checking CPU timing of encoding/decoding on a NEXUS 5.
This is why the test is only triggered by dedicated bot
(android-opus-kitkat-arm-rel).

It is wrapped in a gtest for quick validation at Opus roll time:
* Green: We're all good.
* Red: Manual investigation required.

Bug: chromium:1002973
Change-Id: I80c79cff995fd0d8f5a7fa01b0f92ff99fb318bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1890053Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Felicia Lim <flim@chromium.org>
Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Commit-Queue: Yves Gerey <yvesg@google.com>
Cr-Commit-Position: refs/heads/master@{#712958}