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

ui/base/ime/chromeos/input_method_manager.h

Index: ui/base/ime/chromeos/input_method_manager.h
diff --git a/ui/base/ime/chromeos/input_method_manager.h b/ui/base/ime/chromeos/input_method_manager.h
index 2f992ce5716d296201f4bdfb342fcbee5bae52af..598aafa9ad8ad77cffd531f409a91dc493aab5dd 100644
--- a/ui/base/ime/chromeos/input_method_manager.h
+++ b/ui/base/ime/chromeos/input_method_manager.h
@@ -67,6 +67,17 @@ class UI_BASE_IME_EXPORT InputMethodManager {
     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.
@@ -201,9 +212,11 @@ class UI_BASE_IME_EXPORT InputMethodManager {
   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
@@ -243,6 +256,12 @@ class UI_BASE_IME_EXPORT InputMethodManager {
 
   // 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