Add metrics for interactions with the Apps Launcher promo dialog.

apps/app_launcher.cc

 // 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.
 
 #include "apps/app_launcher.h"
 
+#include "apps/field_trial_names.h"
 #include "apps/pref_names.h"
+#include "base/metrics/field_trial.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/ui/host_desktop.h"
 
 #if defined(OS_WIN)
 #include "chrome/installer/launcher_support/chrome_launcher_support.h"
 #include "chrome/installer/util/browser_distribution.h"
 #endif
 
@@ skipping 10 matching lines @@
     return true;
 #endif
   PrefService* prefs = g_browser_process->local_state();
   // In some tests, the prefs aren't initialised.
   if (!prefs)
     return false;
   return prefs->GetBoolean(prefs::kAppLauncherHasBeenEnabled);
 #endif
 }
 
+bool ShouldShowAppLauncherPromo() {
+  PrefService* local_state = g_browser_process->local_state();
+  // In some tests, the prefs aren't initialised.
+  if (!local_state)
+    return false;
+  std::string app_launcher_promo_group_name =
+      base::FieldTrialList::FindFullName(apps::kLauncherPromoTrialName);
+  return !IsAppLauncherEnabled() &&
+      local_state->GetBoolean(apps::prefs::kShowAppLauncherPromo) &&
+      (app_launcher_promo_group_name == apps::kShowLauncherPromoOnceGroupName ||
+       app_launcher_promo_group_name ==
+          apps::kResetShowLauncherPromoPrefGroupName);
+}
+
 }  // namespace apps