Added probe to determine if data reduction proxy can be used

chrome/chrome_tests_unit.gypi

 # Copyright 2012 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.
 {
   'targets': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 991 matching lines @@
         'browser/net/gaia/gaia_oauth_fetcher_unittest.cc',
         'browser/net/http_pipelining_compatibility_client_unittest.cc',
         'browser/net/http_server_properties_manager_unittest.cc',
         'browser/net/net_error_tab_helper_unittest.cc',
         'browser/net/net_log_temp_file_unittest.cc',
         'browser/net/network_stats_unittest.cc',
         'browser/net/network_time_tracker_unittest.cc',
         'browser/net/predictor_unittest.cc',
         'browser/net/pref_proxy_config_tracker_impl_unittest.cc',
         'browser/net/probe_message_unittest.cc',
+        'browser/net/spdyproxy/data_reduction_proxy_settings_unittest_android.cc',
         'browser/net/spdyproxy/http_auth_handler_spdyproxy_unittest.cc',
         'browser/net/sqlite_server_bound_cert_store_unittest.cc',
         'browser/net/ssl_config_service_manager_pref_unittest.cc',
         'browser/net/transport_security_persister_unittest.cc',
         'browser/net/url_info_unittest.cc',
         'browser/network_time/navigation_time_helper_unittest.cc',
         'browser/notifications/desktop_notification_service_unittest.cc',
         'browser/notifications/message_center_notifications_unittest_win.cc',
         'browser/notifications/message_center_settings_controller_unittest.cc',
         'browser/notifications/sync_notifier/chrome_notifier_service_unittest.cc',
@@ skipping 1767 matching lines @@
               # more details.
               'DebugInformationFormat': '3',
               'ProgramDataBaseFileName': '<(PRODUCT_DIR)/unit_tests.exe.pdb',
             },
           },
         },
       ],
     }],
   ],  # 'conditions'
 }