Check IME state in ImeController

chrome/browser/ui/ash/ime_controller_chromeos.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 "chrome/browser/ui/ash/ime_controller_chromeos.h"
 
 #include "ui/base/accelerators/accelerator.h"
 #include "ui/base/ime/chromeos/input_method_manager.h"
 
 bool ImeController::CanCycleIme() {
   chromeos::input_method::InputMethodManager* manager =
       chromeos::input_method::InputMethodManager::Get();
+  DCHECK(manager);
+  if (!manager->GetActiveIMEState()) {
+    LOG(WARNING) << "Cannot cycle through input methods as they are not "
+                    "initialized yet.";
+    return false;
+  }
   return manager->GetActiveIMEState()->CanCycleInputMethod();
 }
 
 void ImeController::HandleNextIme() {
   chromeos::input_method::InputMethodManager* manager =
       chromeos::input_method::InputMethodManager::Get();
   manager->GetActiveIMEState()->SwitchToNextInputMethod();
 }
 
 void ImeController::HandlePreviousIme() {
   chromeos::input_method::InputMethodManager* manager =
       chromeos::input_method::InputMethodManager::Get();
   manager->GetActiveIMEState()->SwitchToPreviousInputMethod();
 }
 
 bool ImeController::CanSwitchIme(const ui::Accelerator& accelerator) {
   chromeos::input_method::InputMethodManager* manager =
       chromeos::input_method::InputMethodManager::Get();
+  DCHECK(manager);
+  if (!manager->GetActiveIMEState()) {
+    LOG(WARNING) << "Cannot switch input methods as they are not "
+                    "initialized yet.";
+    return false;
+  }
   return manager->GetActiveIMEState()->CanSwitchInputMethod(accelerator);
 }
 
 void ImeController::HandleSwitchIme(const ui::Accelerator& accelerator) {
   chromeos::input_method::InputMethodManager* manager =
       chromeos::input_method::InputMethodManager::Get();
   manager->GetActiveIMEState()->SwitchInputMethod(accelerator);
 }