[cros mp] Load profiles from /home/chronos/u-[$hash], add GetUserIdHashFromProfile()

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 1223 matching lines @@
         'browser/chromeos/media/media_player_browsertest.cc',
         'browser/chromeos/memory/oom_priority_manager_browsertest.cc',
         'browser/chromeos/policy/device_local_account_browsertest.cc',
         'browser/chromeos/policy/device_policy_cros_browser_test.cc',
         'browser/chromeos/policy/device_policy_cros_browser_test.h',
         'browser/chromeos/policy/device_status_collector_browsertest.cc',
         'browser/chromeos/policy/policy_cert_verifier_browsertest.cc',
         'browser/chromeos/policy/power_policy_browsertest.cc',
         'browser/chromeos/policy/variations_service_policy_browsertest.cc',
         'browser/chromeos/power/peripheral_battery_observer_browsertest.cc',
+        'browser/chromeos/profiles/profile_helper_browsertest.cc',
         'browser/chromeos/screensaver/screensaver_controller_browsertest.cc',
         'browser/chromeos/system/tray_accessibility_browsertest.cc',
         'browser/chromeos/ui/idle_logout_dialog_view_browsertest.cc',
         'browser/collected_cookies_browsertest.cc',
         'browser/content_settings/content_settings_browsertest.cc',
         'browser/crash_recovery_browsertest.cc',
         'browser/custom_handlers/protocol_handler_registry_browsertest.cc',
         'browser/devtools/devtools_sanity_browsertest.cc',
         'browser/do_not_track_browsertest.cc',
         'browser/download/download_browsertest.cc',
@@ skipping 2153 matching lines @@
               # more details.
               'DebugInformationFormat': '3',
               'ProgramDataBaseFileName': '<(PRODUCT_DIR)/browser_tests.exe.pdb',
             },
           },
         },
       ],
     }],
   ],  # 'conditions'
 }