Add an option in language settings for activating the IME menu.

chrome/browser/chromeos/input_method/input_method_manager_impl.h

Index: chrome/browser/chromeos/input_method/input_method_manager_impl.h
diff --git a/chrome/browser/chromeos/input_method/input_method_manager_impl.h b/chrome/browser/chromeos/input_method/input_method_manager_impl.h
index 8860afc42c4156180172b3bf4fc5af03a76715c9..174bbd771d2d0e99527aefe5378eece45824775b 100644
--- a/chrome/browser/chromeos/input_method/input_method_manager_impl.h
+++ b/chrome/browser/chromeos/input_method/input_method_manager_impl.h
@@ -150,9 +150,13 @@ class InputMethodManagerImpl : public InputMethodManager,
   void AddObserver(InputMethodManager::Observer* observer) override;
   void AddCandidateWindowObserver(
       InputMethodManager::CandidateWindowObserver* observer) override;
+  void AddImeMenuObserver(
+      InputMethodManager::ImeMenuObserver* observer) override;
   void RemoveObserver(InputMethodManager::Observer* observer) override;
   void RemoveCandidateWindowObserver(
       InputMethodManager::CandidateWindowObserver* observer) override;
+  void RemoveImeMenuObserver(
+      InputMethodManager::ImeMenuObserver* observer) override;
   scoped_ptr<InputMethodDescriptors> GetSupportedInputMethods() const override;
   void ActivateInputMethodMenuItem(const std::string& key) override;
   bool IsISOLevel5ShiftUsedByCurrentInputMethod() const override;
@@ -171,6 +175,9 @@ class InputMethodManagerImpl : public InputMethodManager,
   scoped_refptr<InputMethodManager::State> GetActiveIMEState() override;
   void SetState(scoped_refptr<InputMethodManager::State> state) override;
 
+  void ImeMenuActivated() override;
+  void ImeMenuDeactivated() override;
+
   // Sets |candidate_window_controller_|.
   void SetCandidateWindowControllerForTesting(
       CandidateWindowController* candidate_window_controller);
@@ -237,6 +244,7 @@ class InputMethodManagerImpl : public InputMethodManager,
   // A list of objects that monitor the manager.
   base::ObserverList<InputMethodManager::Observer> observers_;
   base::ObserverList<CandidateWindowObserver> candidate_window_observers_;
+  base::ObserverList<ImeMenuObserver> ime_menu_observers_;
 
   scoped_refptr<StateImpl> state_;