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

ash/ash_switches.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/ash_switches.h"
 
 #include "base/command_line.h"
 #include "base/sys_info.h"
 
 namespace ash {
@@ skipping 89 matching lines @@
 
 // Enables the heads-up display for tracking touch points.
 const char kAshTouchHud[] = "ash-touch-hud";
 
 // (Most) Chrome OS hardware reports ACPI power button releases correctly.
 // Standard hardware reports releases immediately after presses.  If set, we
 // lock the screen or shutdown the system immediately in response to a press
 // 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";
 
   return base::SysInfo::IsRunningOnChromeOS() ||
          base::CommandLine::ForCurrentProcess()->HasSwitch(
              kAshConstrainPointerToRoot);
 }
 
 }  // namespace switches
 }  // namespace ash