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This is a reland of 3ee72aa0

Original change's description:
> Add Opus benchmark (NEXUS5) as gtest.
>
> 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/+/1890053
> Reviewed-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}

TBR=fdoray@chromium.org,jbudorick@chromium.org,flim@chromium.org

Bug: chromium:1002973
Change-Id: Ib22e7fd952e0fa2339a23bb9208a4e9c2f3ca09c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1901074
Commit-Queue: Yves Gerey <yvesg@google.com>
Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712992}