Adds the ability to run chromeos with mus

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 bb583dd1e675baf76592b0582d13a88f6609dfc5..913a7957fbb560b8805184dcfb1567e5cf5f5af8 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -1118,6 +1118,15 @@ const char kWindows8Search[]                = "windows8-search";
 #if BUILDFLAG(ENABLE_PACKAGE_MASH_SERVICES)
 // Used to enable Mus+ash.
 const char kMash[]                          = "mash";
+
+// Used to enable mus as a separate process, but chrome+ash still together.
+const char kMus[] = "mus";
+
+// This is added to child processes launched from mash or mus. The value of
+// this switch is either kMus or kMash. For example, if chrome is run with
+// '--mash' then the child process representing ash is launched with the
+// switch '--mus-config=mash'.
+const char kMusConfig[] = "mus-config";
 #endif
 
 #if BUILDFLAG(ENABLE_PRINT_PREVIEW) && !defined(OFFICIAL_BUILD)