Refactor SetOmahaExperimentLabel out of gcpai and into install_util.

chrome/installer/util/google_update_settings.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 "chrome/installer/util/google_update_settings.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/path_service.h"
@@ skipping 624 matching lines @@
                                data);
 }
 
 bool GoogleUpdateSettings::GetUpdateDetail(bool system_install,
                                            ProductData* data) {
   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
   return GetUpdateDetailForApp(system_install,
                                dist->GetAppGuid().c_str(),
                                data);
 }
+
+bool GoogleUpdateSettings::SetExperimentLabels(
+    bool system_install,
+    const string16& experiment_labels) {
+  HKEY reg_root = system_install ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
+
+  // Use the browser distribution and install level to write to the correct
+  // client state/app guid key.
+  bool success = false;
+  BrowserDistribution* dist = BrowserDistribution::GetDistribution();
+  if (dist->ShouldSetExperimentLabels()) {
+    string16 client_state_path(
+        system_install ? dist->GetStateMediumKey() : dist->GetStateKey());
+    RegKey client_state(
+        reg_root, client_state_path.c_str(), KEY_SET_VALUE);
+    if (experiment_labels.empty()) {
+      success = client_state.DeleteValue(google_update::kExperimentLabels)
+          == ERROR_SUCCESS;
+    } else {
+      success = client_state.WriteValue(google_update::kExperimentLabels,
+          experiment_labels.c_str()) == ERROR_SUCCESS;
+    }
+  }
+
+  return success;
+}