Add private API to notify end of initialization.

chrome/browser/chromeos/input_method/input_method_engine_ibus.cc

Index: chrome/browser/chromeos/input_method/input_method_engine_ibus.cc
diff --git a/chrome/browser/chromeos/input_method/input_method_engine_ibus.cc b/chrome/browser/chromeos/input_method/input_method_engine_ibus.cc
index 9ab9cea1be5c5b3adeb6c1365178a4c61d84b7db..d1311ee9a812d7ef045ba8cb660dab38d605c564 100644
--- a/chrome/browser/chromeos/input_method/input_method_engine_ibus.cc
+++ b/chrome/browser/chromeos/input_method/input_method_engine_ibus.cc
@@ -118,6 +118,13 @@ void InputMethodEngineIBus::Initialize(
     RegisterComponent();
 }
 
+void InputMethodEngineIBus::StartIme() {
+  input_method::InputMethodManager* manager =
+      input_method::InputMethodManager::Get();
+  if (manager && ibus_id_ == manager->GetCurrentInputMethod().id())
+    Enable();
+}
+
 bool InputMethodEngineIBus::SetComposition(
     int context_id,
     const char* text,