Enable installing test CA on Android & add test for it

telemetry/telemetry/internal/backends/chrome/chrome_browser_backend.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import logging
 import pprint
 import shlex
 import sys
 
 from telemetry.core import exceptions
@@ skipping 109 matching lines @@
 
     return args
 
   def GetReplayBrowserStartupArgs(self):
     replay_args = []
     network_backend = self.platform_backend.network_controller_backend
     if not network_backend.is_initialized:
       return []
     proxy_port = network_backend.forwarder.port_pair.remote_port
     replay_args.append('--proxy-server=socks://localhost:%s' % proxy_port)
+
     if not network_backend.is_test_ca_installed:
       # Ignore certificate errors if the platform backend has not created
       # and installed a root certificate.
       replay_args.append('--ignore-certificate-errors')
+    else:
+      # For now, also use '--ignore-certificate-errors' even if test ca is
+      # installed.
+      # TODO(nedn, xunjieli): remove this flag if test ca is installed
+      # (crbug.com/716084)
+      replay_args.append('--ignore-certificate-errors')
+
     return replay_args
 
   def HasBrowserFinishedLaunching(self):
     assert self._port, 'No DevTools port info available.'
     return devtools_client_backend.IsDevToolsAgentAvailable(
         self._port,
         self._browser_target, self)
 
   def _WaitForBrowserToComeUp(self, remote_devtools_port=None):
     """ Wait for browser to come up.
@@ skipping 160 matching lines @@
   def supports_cpu_metrics(self):
     return True
 
   @property
   def supports_memory_metrics(self):
     return True
 
   @property
   def supports_power_metrics(self):
     return True