Refactor SetOmahaExperimentLabel out of gcpai and into install_util.

chrome/installer/util/install_util.cc

Index: chrome/installer/util/install_util.cc
diff --git a/chrome/installer/util/install_util.cc b/chrome/installer/util/install_util.cc
index db710d47d9f85fb116098574e5d5bca6a9f4be7f..628e44af2e7b549148e468c86b19d18644b8ee7a 100644
--- a/chrome/installer/util/install_util.cc
+++ b/chrome/installer/util/install_util.cc
@@ -38,6 +38,13 @@ using installer::ProductState;
 
 namespace {
 
+const wchar_t* kExperimentAppGuids[] = {
+    L"{4DC8B4CA-1BDA-483e-B5FA-D3C12E15B62D}",
+    L"{8A69D345-D564-463C-AFF1-A69D9E530F96}",
+};
+
+const wchar_t kExperimentLabels[] = L"experiment_labels";
+
 const wchar_t kStageBinaryPatching[] = L"binary_patching";
 const wchar_t kStageBuilding[] = L"building";
 const wchar_t kStageConfiguringAutoLaunch[] = L"configuring_auto_launch";
@@ -523,6 +530,27 @@ string16 InstallUtil::GetCurrentDate() {
   return string16(date_str, len);
 }
 
+// static
+bool InstallUtil::SetOmahaExperimentLabel(const string16& experiment_label,
+                                          HKEY registry_hive) {
+  size_t successful_writes = 0;
+  string16 experiment_path;
+  for (size_t i = 0; i < arraysize(kExperimentAppGuids); ++i) {
+    experiment_path = google_update::kRegPathClientState;
+    experiment_path += L"\\";
+    experiment_path += kExperimentAppGuids[i];
+
+    RegKey client_state(registry_hive, experiment_path.c_str(),
+                        KEY_SET_VALUE);
+    if (client_state.WriteValue(kExperimentLabels,
+                                experiment_label.c_str()) == ERROR_SUCCESS) {
+      ++successful_writes;
+    }
+  }
+
+  return (successful_writes == arraysize(kExperimentAppGuids));
+}
+
 // Open |path| with minimal access to obtain information about it, returning
 // true and populating |handle| on success.
 // static