[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..644d1e12122d3c6356ce8f7cf129f31338ca5703 100644
--- a/chromeos/ime/component_extension_ime_manager.h
+++ b/chromeos/ime/component_extension_ime_manager.h
@@ -77,6 +77,9 @@ class CHROMEOS_EXPORT ComponentExtensionIMEManager {
   // be called before using any other function.
   void Initialize(scoped_ptr<ComponentExtensionIMEManagerDelegate> delegate);
 
+  // Notifies the observes 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);