[cronet] Add telemetry driven Android performance test.
Tests performance of:
1. System's HttpURLConnection API
2. Cronet's HttpURLConnection API
3. Cronet's asynchronous API
Tests upload (i.e. POST) and download (i.e. GET) performance.
Tests HTTP and QUIC performance.
Tests large and small request performance.
Tests performance at different concurrency levels.
Uses Telemetry to control testing and establish
USB reverse tethering. Uses lighttpd and quic_server
running on host.
Consists of an Android app and python launch script.
Review URL: https://codereview.chromium.org/
1013483003
Cr-Commit-Position: refs/heads/master@{#332022}