Add a method to read the Omaha experiment_labels value.

chrome/installer/util/google_update_settings_unittest.cc

 // Copyright (c) 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.
 
 #include <windows.h>
 #include <shlwapi.h>  // For SHDeleteKey.
 
 #include "base/memory/scoped_ptr.h"
 #include "base/test/test_reg_util_win.h"
 #include "base/utf_string_conversions.h"
@@ skipping 101 matching lines @@
       }
     }
   }
 
   // Test the writing and deleting functionality of the experiments label
   // helper.
   void TestExperimentsLabelHelper(SystemUserInstall install) {
     BrowserDistribution* chrome =
         BrowserDistribution::GetSpecificDistribution(
             BrowserDistribution::CHROME_BROWSER);
+    std::wstring value;
 #if defined(GOOGLE_CHROME_BUILD)
     EXPECT_TRUE(chrome->ShouldSetExperimentLabels());
 
     EXPECT_TRUE(GoogleUpdateSettings::SetExperimentLabels(
         install == SYSTEM_INSTALL, kTestExperimentLabel));
 
     // Validate that something is written. Only worry about the label itself.
     RegKey key;
-    std::wstring value;
     HKEY root = install == SYSTEM_INSTALL ?
         HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
     string16 state_key = install == SYSTEM_INSTALL ?
         chrome->GetStateMediumKey() : chrome->GetStateKey();
 
     EXPECT_EQ(ERROR_SUCCESS,
               key.Open(root, state_key.c_str(), KEY_QUERY_VALUE));
     EXPECT_EQ(ERROR_SUCCESS,
         key.ReadValue(google_update::kExperimentLabels, &value));
     EXPECT_EQ(kTestExperimentLabel, value);
+    EXPECT_TRUE(GoogleUpdateSettings::ReadExperimentLabels(
+        install == SYSTEM_INSTALL, &value));
+    EXPECT_EQ(kTestExperimentLabel, value);
     key.Close();
 
     // Now that the label is set, test the delete functionality. An empty label
     // should result in deleting the value.
     EXPECT_TRUE(GoogleUpdateSettings::SetExperimentLabels(
         install == SYSTEM_INSTALL, string16()));
     EXPECT_EQ(ERROR_SUCCESS,
               key.Open(root, state_key.c_str(), KEY_QUERY_VALUE));
     EXPECT_EQ(ERROR_FILE_NOT_FOUND,
         key.ReadValue(google_update::kExperimentLabels, &value));
+    EXPECT_FALSE(GoogleUpdateSettings::ReadExperimentLabels(
+        install == SYSTEM_INSTALL, &value));
     key.Close();
 #else
     EXPECT_FALSE(chrome->ShouldSetExperimentLabels());
+    EXPECT_FALSE(GoogleUpdateSettings::ReadExperimentLabels(
+        install == SYSTEM_INSTALL, &value));
 #endif  // GOOGLE_CHROME_BUILD
   }
 
   // Creates "ap" key with the value given as parameter. Also adds work
   // items to work_item_list given so that they can be rolled back later.
   bool CreateApKey(WorkItemList* work_item_list, const std::wstring& value) {
     HKEY reg_root = HKEY_CURRENT_USER;
     std::wstring reg_key = GetApKeyPath();
     work_item_list->AddCreateRegKeyWorkItem(reg_root, reg_key);
     work_item_list->AddSetRegValueWorkItem(reg_root, reg_key,
@@ skipping 817 matching lines @@
         StatsState(StatsState::kSystemLevel, StatsState::MULTI_INSTALL,
                    StatsState::FALSE_SETTING, StatsState::FALSE_SETTING),
         StatsState(StatsState::kSystemLevel, StatsState::MULTI_INSTALL,
                    StatsState::FALSE_SETTING, StatsState::TRUE_SETTING),
         StatsState(StatsState::kSystemLevel, StatsState::MULTI_INSTALL,
                    StatsState::TRUE_SETTING, StatsState::NO_SETTING),
         StatsState(StatsState::kSystemLevel, StatsState::MULTI_INSTALL,
                    StatsState::TRUE_SETTING, StatsState::FALSE_SETTING),
         StatsState(StatsState::kSystemLevel, StatsState::MULTI_INSTALL,
                    StatsState::TRUE_SETTING, StatsState::TRUE_SETTING)));