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This CL notes that on Android run_benchmark requires the device to be rooted.
This should be helpful to people attempting this for the first time. Motivated
by https://bugs.chromium.org/p/chromium/issues/detail?id=1026774#c11.

Change-Id: Ic3fa62ab60c882a4e8ef3f6328242f73c3a6d61e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1946455Reviewed-by: Annie Sullivan <sullivan@chromium.org>
Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720998}