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

ui/base/ime/chromeos/input_method_manager.h

 // 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.
 
 #ifndef UI_BASE_IME_CHROMEOS_INPUT_METHOD_MANAGER_H_
 #define UI_BASE_IME_CHROMEOS_INPUT_METHOD_MANAGER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 49 matching lines @@
   // keyboard is used, since it controls its own candidate window.
   class CandidateWindowObserver {
    public:
     virtual ~CandidateWindowObserver() {}
     // Called when the candidate window is opened.
     virtual void CandidateWindowOpened(InputMethodManager* manager) = 0;
     // Called when the candidate window is closed.
     virtual void CandidateWindowClosed(InputMethodManager* manager) = 0;
   };
 
+  // ImeMenuObserver is notified of events related to the IME menu on the system
+  // tray.
+  class ImeMenuObserver {
+   public:
+    virtual ~ImeMenuObserver() {}
+    // Called when the current input method is changed.  |show_message|
+    // indicates whether the user should be notified of this change.
+    virtual void ImeMenuActivated(InputMethodManager* manager) = 0;
+    virtual void ImeMenuDeactivated(InputMethodManager* manager) = 0;
+  };
+
   class State : public base::RefCounted<InputMethodManager::State> {
    public:
     // Returns a copy of state.
     virtual scoped_refptr<State> Clone() const = 0;
 
     // Adds an input method extension. This function does not takes ownership of
     // |instance|.
     virtual void AddInputMethodExtension(
         const std::string& extension_id,
         const InputMethodDescriptors& descriptors,
@@ skipping 114 matching lines @@
   static UI_BASE_IME_EXPORT void Shutdown();
 
   // Get the current UI session state (e.g. login screen, lock screen, etc.).
   virtual UISessionState GetUISessionState() = 0;
 
   // Adds an observer to receive notifications of input method related
   // changes as desribed in the Observer class above.
   virtual void AddObserver(Observer* observer) = 0;
   virtual void AddCandidateWindowObserver(
       CandidateWindowObserver* observer) = 0;
+  virtual void AddImeMenuObserver(ImeMenuObserver* observer) = 0;
   virtual void RemoveObserver(Observer* observer) = 0;
   virtual void RemoveCandidateWindowObserver(
       CandidateWindowObserver* observer) = 0;
+  virtual void RemoveImeMenuObserver(ImeMenuObserver* observer) = 0;
 
   // Returns all input methods that are supported, including ones not active.
   // This function never returns NULL. Note that input method extensions are NOT
   // included in the result.
   virtual scoped_ptr<InputMethodDescriptors>
       GetSupportedInputMethods() const = 0;
 
   // Activates the input method property specified by the |key|.
   virtual void ActivateInputMethodMenuItem(const std::string& key) = 0;
 
@@ skipping 19 matching lines @@
       std::vector<std::string>* input_method_ids) = 0;
 
   // Returns new empty state for the |profile|.
   virtual scoped_refptr<State> CreateNewState(Profile* profile) = 0;
 
   // Returns active state.
   virtual scoped_refptr<InputMethodManager::State> GetActiveIMEState() = 0;
 
   // Replaces active state.
   virtual void SetState(scoped_refptr<State> state) = 0;
+
+  // Acitvated the IME Menu.
+  virtual void ImeMenuActivated() = 0;
+
+  // Deactivated the IME Menu.
+  virtual void ImeMenuDeactivated() = 0;
 };
 
 }  // namespace input_method
 }  // namespace chromeos
 
 #endif  // UI_BASE_IME_CHROMEOS_INPUT_METHOD_MANAGER_H_