Implement an AutoLaunch experiment for Chrome for certain brand codes.

chrome/browser/auto_launch_trial.cc

+// Copyright (c) 2011 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/browser/auto_launch_trial.h"
+
+#include "base/file_path.h"
+#include "base/metrics/field_trial.h"
+#include "base/metrics/histogram.h"
+#include "chrome/browser/first_run/first_run.h"
+#include "chrome/installer/util/master_preferences_constants.h"
+#include "chrome/installer/util/master_preferences.h"
+
+const char kAutoLaunchTrialName[] = "AutoLaunchExperiment";
+const char kAutoLaunchTrialAutoLaunchGroup[] = "AutoLaunching";
+const char kAutoLaunchTrialControlGroup[] = "NotAutoLaunching";
+
+namespace auto_launch_trial {
+
+bool IsInAutoLaunchGroup() {
+  static bool checked_flags = false;
+  static bool is_in_group = false;
+
+  if (!checked_flags) {
+    FilePath master_prefs = FirstRun::MasterPrefsPath();
+    if (!master_prefs.empty()) {
+      installer::MasterPreferences prefs(master_prefs);
+      if (prefs.read_from_file()) {
+        prefs.GetBool(
+            installer::master_preferences::kAutoLaunchChrome, &is_in_group);
+      }
+    }
+
+    checked_flags = true;
+  }
+
+  if (is_in_group)
+    return true;
+
+  return base::FieldTrialList::TrialExists(kAutoLaunchTrialName) &&
+         base::FieldTrialList::Find(kAutoLaunchTrialName)->group_name()
+             == kAutoLaunchTrialAutoLaunchGroup;

[Roger Tawa OOO till Jul 10th, 2011/12/13 17:05:19]

After looking at this again, I believe my original comment was not correct.  You
don't need to check the master prefs here.

+}
+
+void UpdateToggleAutoLaunchMetric(bool auto_launch) {
+  UMA_HISTOGRAM_ENUMERATION(
+      base::FieldTrial::MakeName("ToggleAutoLaunch", kAutoLaunchTrialName),
+      auto_launch ? 1 : 0, 2);
+}
+
+void UpdateInfobarResponseMetric(InfobarMetricResponse response) {
+  UMA_HISTOGRAM_ENUMERATION(
+      base::FieldTrial::MakeName("InfobarRepsonse", kAutoLaunchTrialName),
+      response, 3);
+}
+
+void UpdateInfobarShownMetric() {
+  UMA_HISTOGRAM_COUNTS(
+      base::FieldTrial::MakeName("InfobarShown", kAutoLaunchTrialName), 1);
+}
+
+}  // namespace auto_launch_trial