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

ash/mus/bridge/shell_port_mash.cc

 // Copyright 2016 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/mus/bridge/shell_port_mash.h"
 
 #include <utility>
 
 #include "ash/accelerators/accelerator_controller.h"
 #include "ash/accelerators/accelerator_controller_delegate_aura.h"
@@ skipping 32 matching lines @@
 #include "ash/wm/maximize_mode/maximize_mode_event_handler_aura.h"
 #include "ash/wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard.h"
 #include "ash/wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard_ozone.h"
 #include "ash/wm/mru_window_tracker.h"
 #include "ash/wm/window_cycle_event_filter.h"
 #include "ash/wm/window_cycle_event_filter_aura.h"
 #include "ash/wm/window_resizer.h"
 #include "ash/wm/window_util.h"
 #include "ash/wm/workspace/workspace_event_handler_aura.h"
 #include "ash/wm_window.h"
+#include "base/command_line.h"
 #include "base/memory/ptr_util.h"
 #include "components/user_manager/user_info_impl.h"
 #include "services/ui/public/interfaces/constants.mojom.h"
 #include "ui/aura/env.h"
 #include "ui/aura/mus/focus_synchronizer.h"
 #include "ui/aura/mus/window_tree_client.h"
 #include "ui/aura/mus/window_tree_host_mus.h"
 #include "ui/aura/mus/window_tree_host_mus_init_params.h"
 #include "ui/aura/window.h"
 #include "ui/display/manager/display_manager.h"
@@ skipping 419 matching lines @@
   if (mirrored_display.is_valid()) {
     display_params->display =
         base::MakeUnique<display::Display>(mirrored_display);
   }
   // TODO: wire update is_primary_display correctly.
   display_params->is_primary_display = true;
   aura::WindowTreeHostMusInitParams aura_init_params =
       window_manager_->window_manager_client()->CreateInitParamsForNewDisplay();
   aura_init_params.display_id = init_params.display_id;
   aura_init_params.display_init_params = std::move(display_params);
-  aura_init_params.use_classic_ime = true;
+  aura_init_params.use_classic_ime = !Shell::ShouldUseIMEService();
   return base::MakeUnique<AshWindowTreeHostMus>(std::move(aura_init_params));
 }
 
 void ShellPortMash::OnCreatedRootWindowContainers(
     RootWindowController* root_window_controller) {
   // TODO: To avoid lots of IPC AddActivationParent() should take an array.
   // http://crbug.com/682048.
   aura::Window* root_window = root_window_controller->GetRootWindow();
   for (size_t i = 0; i < kNumActivatableShellWindowIds; ++i) {
     window_manager_->window_manager_client()->AddActivationParent(
@@ skipping 61 matching lines @@
   mash_state_->accelerator_controller_registrar =
       base ::MakeUnique<AcceleratorControllerRegistrar>(
           window_manager_, accelerator_namespace_id);
   return base::MakeUnique<AcceleratorController>(
       mash_state_->accelerator_controller_delegate.get(),
       mash_state_->accelerator_controller_registrar.get());
 }
 
 }  // namespace mus
 }  // namespace ash