Move top_20 tests to a separate suite

tools/chrome_proxy/live_tests/chrome_proxy_metrics.py

 # Copyright 2014 The Chromium Authors. All rights reserved.

[sclittle, 2015/04/23 01:07:50]

This file is the same as the integration_tests one, why do we have two of them?

Instead of having duplication, maybe this file could just import that one, but
extend it with additional tests? Another option would be to cut this metrics
file down to only include the latency and data savings metrics or whatever.

[bustamante, 2015/04/23 02:26:09]

I went with the latter option, apologies that should have been done in the first
iteration.

 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import logging
 import time
 
 from integration_tests import network_metrics
 from telemetry.page import page_test
 from telemetry.value import scalar
 
@@ skipping 561 matching lines @@
         via_count += 1
     if via_count == 0:
       raise ChromeProxyMetricException, (
           'Expected at least one response through the proxy after the bypass '
           'expired, but zero such responses were received.')
 
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'bypass', 'count', bypass_count))
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'via', 'count', via_count))