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This adds some very basic performance testing to the Cronet test suite.

Bug: 706515
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I64f4a24baf8fe92d2d9d865752cbff4bcb2df12c
Reviewed-on: https://chromium-review.googlesource.com/649991Reviewed-by: Misha Efimov <mef@chromium.org>
Reviewed-by: Andrei Kapishnikov <kapishnikov@chromium.org>
Commit-Queue: Andrei Kapishnikov <kapishnikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512830}