[Cronet] Get Cronet performance test running again

1. Enable HTTPS for QUIC
  a. Insert a MockCertVerifier to pretend our cert is in root store
  b. Insert HostResolver rules to pretend test.example.com resolves
     to the the IP address of the USB reverse-tether interface
  c. Switch from using libcronet.so to libcronet_test.so as it
     contains several utilities we need (e.g. MockCertVerifier).
     This required making a Cronet testing Java target.
  d. Pass private key and cert to quic_server
  e. Copy cert to device
2. Call PathUtils.setPrivateDataDirectorySuffix() to avoid crash
3. Modify proguard options to avoid crbug.com/488192
4. Make Telemetry happy again
  a. Put basic header in config file
  b. Specify default_chrome_root
5. Avoid Theme.NoDisplay as it fails with Android Marshmallow

Review URL: https://codereview.chromium.org/1536433002

Cr-Commit-Position: refs/heads/master@{#372684}

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