Add perf histogram and tests for inline signin

chrome/browser/signin/signin_promo.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 "chrome/browser/signin/signin_promo.h"
 
+#include "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/first_run/first_run.h"
 #include "chrome/browser/google/google_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_info_cache.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/signin/signin_manager.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
 #include "chrome/browser/sync/profile_sync_service.h"
 #include "chrome/browser/sync/profile_sync_service_factory.h"
 #include "chrome/browser/ui/webui/options/core_options_handler.h"
 #include "chrome/browser/ui/webui/theme_source.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/common/net/url_util.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/profile_management_switches.h"
 #include "chrome/common/url_constants.h"
 #include "components/user_prefs/pref_registry_syncable.h"
 #include "content/public/browser/url_data_source.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_ui.h"
 #include "content/public/browser/web_ui_data_source.h"
 #include "google_apis/gaia/gaia_urls.h"
@@ skipping 77 matching lines @@
 #endif
 }
 
 bool ShouldShowPromoAtStartup(Profile* profile, bool is_new_profile) {
   DCHECK(profile);
 
   // Don't show if the profile is an incognito.
   if (profile->IsOffTheRecord())
     return false;
 
+  const CommandLine* command_line = CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kForceSigninPromo))
+    return true;
+
   if (!ShouldShowPromo(profile))
     return false;
 
   if (!is_new_profile) {
     if (!HasShownPromoAtStartup(profile))
       return false;
   }
 
   if (HasUserSkippedPromo(profile))
     return false;
@@ skipping 143 matching lines @@
       prefs::kSignInPromoShowOnFirstRunAllowed,
       true,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
   registry->RegisterBooleanPref(
       prefs::kSignInPromoShowNTPBubble,
       false,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 }  // namespace signin