Makes IBusConfigClient initialize asynchronous.

chromeos/dbus/ibus/ibus_config_client.h

Index: chromeos/dbus/ibus/ibus_config_client.h
diff --git a/chromeos/dbus/ibus/ibus_config_client.h b/chromeos/dbus/ibus/ibus_config_client.h
index cb7e91b3b8811bd8613b1a1e4fc1a0def7e83aac..fc98fd8118a982cb8be8755e1b0efb6af03df22e 100644
--- a/chromeos/dbus/ibus/ibus_config_client.h
+++ b/chromeos/dbus/ibus/ibus_config_client.h
@@ -30,8 +30,13 @@ class IBusInputContextClient;
 class CHROMEOS_EXPORT IBusConfigClient {
  public:
   typedef base::Callback<void()> ErrorCallback;
+  typedef base::Callback<void()> OnIBusConfigReady;
   virtual ~IBusConfigClient();
 
+  // Initializes IBusConfig asynchronously. |on_ready| will be called if it is
+  // ready.
+  virtual void InitializeAsync(const OnIBusConfigReady& on_ready) = 0;
+
   // Requests the IBusConfig to set a string value.
   virtual void SetStringValue(const std::string& section,
                               const std::string& key,
@@ -72,4 +77,4 @@ class CHROMEOS_EXPORT IBusConfigClient {
 
 }  // namespace chromeos
 
-#endif  // CHROMEOS_DBUS_IBUS_IBUS_CLIENT_H_
+#endif  // CHROMEOS_DBUS_IBUS_IBUS_CONFIG_CLIENT_H_