Revert of Remove InputMethodEventHandler.

ash/display/window_tree_host_manager.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/display/window_tree_host_manager.h"
 
 #include <algorithm>
 #include <cmath>
 #include <map>
 #include <memory>
 #include <utility>
 
 #include "ash/ash_switches.h"
 #include "ash/display/cursor_window_controller.h"
 #include "ash/display/mirror_window_controller.h"
 #include "ash/display/root_window_transformers.h"
 #include "ash/host/ash_window_tree_host.h"
 #include "ash/host/ash_window_tree_host_init_params.h"
 #include "ash/host/root_window_transformer.h"
+#include "ash/ime/input_method_event_handler.h"
 #include "ash/magnifier/magnification_controller.h"
 #include "ash/magnifier/partial_magnification_controller.h"
 #include "ash/public/cpp/config.h"
 #include "ash/root_window_controller.h"
 #include "ash/root_window_settings.h"
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray.h"
 #include "ash/wm/window_util.h"
 #include "base/command_line.h"
 #include "base/strings/stringprintf.h"
@@ skipping 802 matching lines @@
   // When using IME service, input method is hosted by the browser process, so
   // we don't need to create and set it here.
   if (!Shell::ShouldUseIMEService()) {
     DCHECK(!host->has_input_method());
     if (!input_method_) {  // Singleton input method instance for Ash.
       input_method_ = ui::CreateInputMethod(this, host->GetAcceleratedWidget());
       // Makes sure the input method is focused by default when created, because
       // Ash uses singleton InputMethod and it won't call OnFocus/OnBlur when
       // the active window changed.
       input_method_->OnFocus();
+      input_method_event_handler_.reset(
+          new InputMethodEventHandler(input_method_.get()));
     }
     host->SetSharedInputMethod(input_method_.get());
+    ash_host->set_input_method_handler(input_method_event_handler_.get());
   }
 
   host->window()->SetName(base::StringPrintf(
       "%sRootWindow-%d", params_with_bounds.offscreen ? "Offscreen" : "",
       host_count++));
   host->window()->SetTitle(base::UTF8ToUTF16(display_info.name()));
   host->compositor()->SetBackgroundColor(SK_ColorBLACK);
   // No need to remove our observer observer because the WindowTreeHostManager
   // outlives the host.
   host->AddObserver(this);
   InitRootWindowSettings(host->window())->display_id = display.id();
   host->InitHost();
   host->window()->Show();
 
   window_tree_hosts_[display.id()] = ash_host;
   SetDisplayPropertiesOnHost(ash_host, display);
 
   if (switches::ConstrainPointerToRoot())
     ash_host->ConfineCursorToRootWindow();
   return ash_host;
 }
 
 }  // namespace ash