Add --use-ime-service command line flag to enable InputMethodMus in --mus.

ash/ash_switches.cc

Index: ash/ash_switches.cc
diff --git a/ash/ash_switches.cc b/ash/ash_switches.cc
index 0f55bdfefbebcc901c1dbc37f1bd696d60dff55c..c3fdda957aeb61318e666e5378ac8b4f1d6d5e7a 100644
--- a/ash/ash_switches.cc
+++ b/ash/ash_switches.cc
@@ -107,6 +107,10 @@ const char kAshTouchHud[] = "ash-touch-hud";
 // instead of displaying an interactive animation.
 const char kAuraLegacyPowerButton[] = "aura-legacy-power-button";
 
+// By default we use classic IME (i.e. InputMethodChromeOS) in kMus. This flag
+// enables the servicified IME (i.e. InputMethodMus) instead.
+const char kUseServicifiedIME[] = "use-servicified-ime";

[sky, 2017/05/05 14:22:36]

'serficified' is a bit unusual of a name. How about naming this
--use-ime-service and update the description appropriately?

[Hadi, 2017/05/05 14:51:57]

Done.

+
 // Constrains the pointer movement within a root window on desktop.
 bool ConstrainPointerToRoot() {
   const char kAshConstrainPointerToRoot[] = "ash-constrain-pointer-to-root";