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 f3bfd8e80eda0da7f778ef629d217b0f48058e14..0e4d684dee4a2630ef3b48ab8cc7a3a92cc8c0a8 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -12,6 +12,10 @@ namespace prefs {
 // *************** PROFILE PREFS ***************
 // These are attached to the user profile
 
+#if defined(ENABLE_ARC)
+// 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.