Makes delay commitText/setComposition can deal with empty text/composition.

chrome/browser/ui/input_method/input_method_engine_base.h

Index: chrome/browser/ui/input_method/input_method_engine_base.h
diff --git a/chrome/browser/ui/input_method/input_method_engine_base.h b/chrome/browser/ui/input_method/input_method_engine_base.h
index b763fe93112065ddae47280ba0a21d01f7343ae1..8d7899a1e33938b871ee45ab3e2bb756e39d2634 100644
--- a/chrome/browser/ui/input_method/input_method_engine_base.h
+++ b/chrome/browser/ui/input_method/input_method_engine_base.h
@@ -177,9 +177,6 @@ class InputMethodEngineBase : virtual public ui::IMEEngineHandlerInterface {
       const std::string& component_id,
       ui::IMEEngineHandlerInterface::KeyEventDoneCallback& key_data);
 
-  // Called when a key event is handled.
-  void KeyEventHandled();
-
  protected:
   // Notifies InputContextHandler that the composition is changed.
   virtual void UpdateComposition(const ui::CompositionText& composition_text,
@@ -229,9 +226,11 @@ class InputMethodEngineBase : virtual public ui::IMEEngineHandlerInterface {
 
   // The composition text to be set from calling input.ime.setComposition API.
   ui::CompositionText composition_;
+  bool composition_changed_;
 
   // The text to be committed from calling input.ime.commitText API.
   std::string text_;
+  bool commit_text_changed_;
 
   // Indicates whether the IME extension is currently handling a physical key
   // event. This is used in CommitText/UpdateCompositionText/etc.