arc-app-launcher: Minimal support for ARC app launcher.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 1f2e778abe42bdd4bddc6fb8dc3b25716171aeed..88a8264caf543e71c93b128e310eea1f7f7d6d66 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -13,6 +13,10 @@ namespace prefs {
 // *************** PROFILE PREFS ***************
 // These are attached to the user profile
 
+#if defined(OS_CHROMEOS) && defined(ENABLE_APP_LIST)
+// A preference to keep list of ARC apps and its state.
+const char kArcApps[] = "arc.apps";
+#endif
 
 // A bool pref that keeps whether the child status for this profile was already
 // successfully checked via ChildAccountService.