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

chrome/browser/ui/webui/ntp/app_launcher_handler.cc

Index: chrome/browser/ui/webui/ntp/app_launcher_handler.cc
diff --git a/chrome/browser/ui/webui/ntp/app_launcher_handler.cc b/chrome/browser/ui/webui/ntp/app_launcher_handler.cc
index 83e24d10199704da5eb312d967902a7148d6800b..1c4497f054a8190e7f3c77c09741926fc03e7112 100644
--- a/chrome/browser/ui/webui/ntp/app_launcher_handler.cc
+++ b/chrome/browser/ui/webui/ntp/app_launcher_handler.cc
@@ -6,6 +6,7 @@
 
 #include <vector>
 
+#include "apps/pref_names.h"
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ -15,6 +16,7 @@
 #include "base/prefs/pref_service.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
+#include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ -165,6 +167,12 @@ void AppLauncherHandler::RegisterMessages() {
   registrar_.Add(this, chrome::NOTIFICATION_APP_INSTALLED_TO_NTP,
       content::Source<WebContents>(web_ui()->GetWebContents()));
 
+  local_state_pref_change_registrar_.Init(g_browser_process->local_state());
+  local_state_pref_change_registrar_.Add(
+      apps::prefs::kShowAppLauncherPromo,
+      base::Bind(&AppLauncherHandler::OnLocalStatePreferenceChanged,
+                 base::Unretained(this)));
+
   web_ui()->RegisterMessageCallback("getApps",
       base::Bind(&AppLauncherHandler::HandleGetApps,
                  base::Unretained(this)));
@@ -195,6 +203,9 @@ void AppLauncherHandler::RegisterMessages() {
   web_ui()->RegisterMessageCallback("recordAppLaunchByURL",
       base::Bind(&AppLauncherHandler::HandleRecordAppLaunchByUrl,
                  base::Unretained(this)));
+  web_ui()->RegisterMessageCallback("stopShowingAppLauncherPromo",
+      base::Bind(&AppLauncherHandler::StopShowingAppLauncherPromo,
+                 base::Unretained(this)));
 }
 
 void AppLauncherHandler::Observe(int type,
@@ -392,12 +403,13 @@ void AppLauncherHandler::HandleGetApps(const ListValue* args) {
   // the apps as they change.
   if (!has_loaded_apps_) {
     base::Closure callback = base::Bind(
-        &AppLauncherHandler::OnPreferenceChanged,
+        &AppLauncherHandler::OnExtensionPreferenceChanged,
         base::Unretained(this));
-    pref_change_registrar_.Init(
+    extension_pref_change_registrar_.Init(
         extension_service_->extension_prefs()->pref_service());
-    pref_change_registrar_.Add(ExtensionPrefs::kExtensionsPref, callback);
-    pref_change_registrar_.Add(prefs::kNtpAppPageNames, callback);
+    extension_pref_change_registrar_.Add(ExtensionPrefs::kExtensionsPref,
+                                         callback);
+    extension_pref_change_registrar_.Add(prefs::kNtpAppPageNames, callback);
 
     registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_LOADED,
         content::Source<Profile>(profile));
@@ -662,6 +674,12 @@ void AppLauncherHandler::HandleRecordAppLaunchByUrl(
   RecordAppLaunchByUrl(Profile::FromWebUI(web_ui()), url, bucket);
 }
 
+void AppLauncherHandler::StopShowingAppLauncherPromo(
+    const base::ListValue* args) {
+  g_browser_process->local_state()->SetBoolean(
+      apps::prefs::kShowAppLauncherPromo, false);
+}
+
 void AppLauncherHandler::OnFaviconForApp(
     scoped_ptr<AppInstallInfo> install_info,
     const history::FaviconImageResult& image_result) {
@@ -696,12 +714,19 @@ void AppLauncherHandler::SetAppToBeHighlighted() {
   highlight_app_id_.clear();
 }
 
-void AppLauncherHandler::OnPreferenceChanged() {
+void AppLauncherHandler::OnExtensionPreferenceChanged() {
   DictionaryValue dictionary;
   FillAppDictionary(&dictionary);
   web_ui()->CallJavascriptFunction("ntp.appsPrefChangeCallback", dictionary);
 }
 
+void AppLauncherHandler::OnLocalStatePreferenceChanged() {
+  web_ui()->CallJavascriptFunction(
+      "ntp.appLauncherPromoPrefChangeCallback",
+      base::FundamentalValue(g_browser_process->local_state()->GetBoolean(
+          apps::prefs::kShowAppLauncherPromo)));
+}
+
 // static
 void AppLauncherHandler::RegisterUserPrefs(PrefRegistrySyncable* registry) {
   registry->RegisterListPref(prefs::kNtpAppPageNames,