Add a function to send scripts from a browsertest to an extension's background page.

chrome/chrome_tests.gypi

 # 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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 196 matching lines @@
       'sources': [
         '../apps/app_shim/app_shim_quit_interactive_uitest_mac.mm',
         '../ui/views/corewm/desktop_capture_controller_unittest.cc',
         'browser/apps/app_browsertest_util.cc',
         'browser/apps/app_browsertest_util.h',
         'browser/apps/web_view_interactive_browsertest.cc',
         'browser/autofill/autofill_interactive_uitest.cc',
         'browser/browser_keyevents_browsertest.cc',
         'browser/extensions/api/omnibox/omnibox_api_interactive_test.cc',
         'browser/extensions/api/tabs/tabs_interactive_test.cc',
+        'browser/extensions/browsertest_util.cc',
         'browser/extensions/extension_apitest.cc',
         'browser/extensions/extension_browsertest.cc',
         'browser/extensions/extension_crash_recovery_browsertest.cc',
         'browser/extensions/extension_function_test_utils.cc',
         'browser/extensions/extension_keybinding_apitest.cc',
         'browser/extensions/extension_test_message_listener.cc',
         'browser/extensions/extension_test_message_listener.h',
         'browser/extensions/notifications_apitest.cc',
         'browser/extensions/window_open_interactive_apitest.cc',
         'browser/extensions/extension_fullscreen_apitest.cc',
@@ skipping 1153 matching lines @@
         'browser/extensions/api/usb/usb_apitest.cc',
         'browser/extensions/api/usb/usb_manual_apitest.cc',
         'browser/extensions/api/web_navigation/web_navigation_apitest.cc',
         'browser/extensions/api/web_request/web_request_apitest.cc',
         'browser/extensions/api/webstore_private/webstore_private_apitest.cc',
         'browser/extensions/app_background_page_apitest.cc',
         'browser/extensions/app_process_apitest.cc',
         'browser/extensions/background_app_browsertest.cc',
         'browser/extensions/background_page_apitest.cc',
         'browser/extensions/background_scripts_apitest.cc',
+        'browser/extensions/browsertest_util.cc',
+        'browser/extensions/browsertest_util.h',
+        'browser/extensions/browsertest_util_browsertest.cc',
         'browser/extensions/chrome_app_api_browsertest.cc',
         'browser/extensions/content_script_apitest.cc',
         'browser/extensions/content_security_policy_apitest.cc',
         'browser/extensions/convert_web_app_browsertest.cc',
         'browser/extensions/crazy_extension_browsertest.cc',
         'browser/extensions/cross_origin_xhr_apitest.cc',
         'browser/extensions/crx_installer_browsertest.cc',
         'browser/extensions/docs/examples/apps/calculator_browsertest.cc',
         'browser/extensions/error_console/error_console_browsertest.cc',
         'browser/extensions/events_apitest.cc',
@@ skipping 770 matching lines @@
       ],
       'sources': [
         '../components/autofill/content/renderer/test_password_autofill_agent.cc',
         '../components/autofill/content/renderer/test_password_autofill_agent.h',
         'app/breakpad_mac_stubs.mm',
         'app/chrome_command_ids.h',
         'app/chrome_dll.rc',
         'app/chrome_dll_resource.h',
         'app/chrome_version.rc.version',
         'browser/extensions/api/tab_capture/tab_capture_performancetest.cc',
+        'browser/extensions/browsertest_util.cc',
         'browser/extensions/extension_apitest.cc',
         'browser/extensions/extension_browsertest.cc',
         'test/base/chrome_render_view_test.cc',
         'test/base/chrome_render_view_test.h',
         'test/base/chrome_test_launcher.cc',
         'test/perf/browser_perf_test.cc',
         'test/perf/browser_perf_test.h',
         'test/perf/rendering/throughput_tests.cc',
       ],
       'rules': [
@@ skipping 1283 matching lines @@
             'utility',
           ],
           'sources': [
             'tools/service_discovery_sniffer/service_discovery_sniffer.h',
             'tools/service_discovery_sniffer/service_discovery_sniffer.cc',
           ],
         }]
     }],
   ],  # 'conditions'
 }