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

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 513039245c1daf9776e47a31ddbc21a9ac862be2..260ee88c951654da5ca18a9e85ac347fd8dc49ec 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -102,6 +102,10 @@ const char kAppsNewInstallBubble[]          = "apps-new-install-bubble";
 // Disable throbber for extension apps.
 const char kAppsNoThrob[]                   = "apps-no-throb";
 
+// Helps test the apps promo by resetting the local state pref that prevents
+// it from being shown because it was dismissed.
+const char kResetShowAppsPromo[]            = "reset-show-apps-promo";
+
 // Whitelist of servers that Negotiate will generate delegated Kerberos tickets
 // for.
 const char kAuthNegotiateDelegateWhitelist[] =