[IME] Removes the duplicated IMEs in chrome://settings/languages, and support async component IMEs …

chromeos/ime/component_extension_ime_manager.h

Index: chromeos/ime/component_extension_ime_manager.h
diff --git a/chromeos/ime/component_extension_ime_manager.h b/chromeos/ime/component_extension_ime_manager.h
index 8d7975820e9797501dc1b6661302e81ca339d2dc..fad81d3aa426b9da17c0d9a5db4b231352a634a6 100644
--- a/chromeos/ime/component_extension_ime_manager.h
+++ b/chromeos/ime/component_extension_ime_manager.h
@@ -66,7 +66,7 @@ class CHROMEOS_EXPORT ComponentExtensionIMEManager {
   class Observer {
    public:
     // Called when the initialization is done.
-    virtual void OnInitialized() = 0;
+    virtual void OnImeComponentExtensionInitialized() = 0;
   };
 
   ComponentExtensionIMEManager();
@@ -77,6 +77,9 @@ class CHROMEOS_EXPORT ComponentExtensionIMEManager {
   // be called before using any other function.
   void Initialize(scoped_ptr<ComponentExtensionIMEManagerDelegate> delegate);
 
+  // Notifies the observers for the component extension IMEs are initialized.
+  void NotifyInitialized();
+
   // Returns true if the initialization is done, otherwise returns false.
   bool IsInitialized();
 
@@ -114,6 +117,9 @@ class CHROMEOS_EXPORT ComponentExtensionIMEManager {
   // Returns all IME as InputMethodDescriptors.
   input_method::InputMethodDescriptors GetAllIMEAsInputMethodDescriptor();
 
+  // Returns all XKB keyboard IME as InputMethodDescriptors.
+  input_method::InputMethodDescriptors GetXkbIMEAsInputMethodDescriptor();
+
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
@@ -135,6 +141,8 @@ class CHROMEOS_EXPORT ComponentExtensionIMEManager {
 
   bool is_initialized_;
 
+  bool was_initialization_notified_;
+
   std::set<std::string> login_layout_set_;
 
   DISALLOW_COPY_AND_ASSIGN(ComponentExtensionIMEManager);