chromeos: Adds --mus flag

chrome/browser/flag_descriptions.cc

Index: chrome/browser/flag_descriptions.cc
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index 635a4c38fd2b0aee8933d8c8015ad997a4057e94..64f175ceb9fb5a30a15f40465f370a626a12d7ae 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -915,9 +915,15 @@ const char kReducedReferrerGranularityDescription[] =
 
 #if defined(OS_CHROMEOS)
 
-const char kUseMashName[] = "Mojo UI Service (mus).";
+const char kUseMusDescription[] = "Enable the Mojo UI service.";
 
-const char kUseMashDescription[] = "Enable mus, mash etc.";
+const char kUseMusName[] = "Mus";
+
+const char kEnableMashDescription[] =
+    "Mash (UI, Chrome and ash in separate services)";
+
+const char kEnableMusDescription[] =
+    "Mus (UI in separate service, Chrome and ash in same service)";
 
 const char kAllowTouchpadThreeFingerClickName[] = "Touchpad three-finger-click";