Add a new App launcher promo to the apps page / NTP.

chrome/browser/chrome_browser_field_trials.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/browser/chrome_browser_field_trials.h"
 
 #include <string>
 
+#include "apps/field_trial_names.h"
+#include "apps/pref_names.h"
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
+#include "base/prefs/pref_service.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/auto_launch_trial.h"
 #include "chrome/browser/google/google_util.h"
 #include "chrome/browser/gpu/chrome_gpu_util.h"
 #include "chrome/browser/metrics/variations/variations_service.h"
 #include "chrome/browser/omnibox/omnibox_field_trial.h"
 #include "chrome/browser/prerender/prerender_field_trial.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/safe_browsing/safe_browsing_blocking_page.h"
 #include "chrome/browser/ui/sync/one_click_signin_helper.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/metrics/variations/uniformity_field_trials.h"
 #include "chrome/common/metrics/variations/variations_util.h"
+#include "chrome/common/pref_names.h"
 #include "net/socket/client_socket_pool_base.h"
 #include "net/spdy/spdy_session.h"
 #include "ui/base/layout.h"
 
 #if defined(OS_WIN)
 #include "net/socket/tcp_client_socket_win.h"
 #endif  // defined(OS_WIN)
 
 namespace {
 
@@ skipping 10 matching lines @@
 }  // namespace
 
 ChromeBrowserFieldTrials::ChromeBrowserFieldTrials(
     const CommandLine& parsed_command_line) :
         parsed_command_line_(parsed_command_line) {
 }
 
 ChromeBrowserFieldTrials::~ChromeBrowserFieldTrials() {
 }
 
-void ChromeBrowserFieldTrials::SetupFieldTrials(
-    const base::Time& install_time) {
+void ChromeBrowserFieldTrials::SetupFieldTrials(PrefService* local_state) {
+  const base::Time install_time = base::Time::FromTimeT(
+      local_state->GetInt64(prefs::kInstallDate));
+  DCHECK(!install_time.is_null());
   chrome_variations::SetupUniformityFieldTrials(install_time);
   SetUpSimpleCacheFieldTrial();
 #if !defined(OS_ANDROID)
   SetupDesktopFieldTrials();
 #endif  // defined(OS_ANDROID)
+  // This is not quite a field trial initialization, but it's an initialization
+  // that depends on a field trial, so why not? :-)
+  if (base::FieldTrialList::FindFullName(apps::kLauncherPromoTrialName) ==

[Alexei Svitkine (slow), 2013/03/22 16:57:35]

Please encapsulate this in a separate function and call it from
SetupDesktopFieldTrials().

[MAD, 2013/03/22 17:11:35]

Done.

+      apps::kResetShowLauncherPromoPrefGroup) {
+    local_state->SetBoolean(apps::prefs::kShowAppLauncherPromo, true);
+  }
 }
 
 void ChromeBrowserFieldTrials::SetupDesktopFieldTrials() {
   prerender::ConfigurePrefetchAndPrerender(parsed_command_line_);
   SpdyFieldTrial();
   WarmConnectionFieldTrial();
   AutoLaunchChromeFieldTrial();
   gpu_util::InitializeCompositingFieldTrial();
   OmniboxFieldTrial::ActivateStaticTrials();
   SetUpInfiniteCacheFieldTrial();
@@ skipping 194 matching lines @@
   // Call |FindValue()| on the trials below, which may come from the server, to
   // ensure they get marked as "used" for the purposes of data reporting.
   base::FieldTrialList::FindValue("UMA-Dynamic-Binary-Uniformity-Trial");
   base::FieldTrialList::FindValue("UMA-Dynamic-Uniformity-Trial");
   base::FieldTrialList::FindValue("InstantDummy");
   base::FieldTrialList::FindValue("InstantChannel");
   base::FieldTrialList::FindValue("Test0PercentDefault");
   // Activate the autocomplete dynamic field trials.
   OmniboxFieldTrial::ActivateDynamicTrials();
 }