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

chrome/browser/ui/input_method/input_method_engine_base.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_INPUT_METHOD_INPUT_METHOD_ENGINE_BASE_H_
 #define CHROME_BROWSER_UI_INPUT_METHOD_INPUT_METHOD_ENGINE_BASE_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 159 matching lines @@
   // Called when a key event is handled.
   void KeyEventHandled(const std::string& extension_id,
                        const std::string& request_id,
                        bool handled);
 
   // Adds unprocessed key event to |request_map_|.
   std::string AddRequest(
       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,
                                  uint32_t cursor_pos,
                                  bool is_visible) = 0;
   // Notifies InputContextHanlder to commit |text|.
   virtual void CommitTextToInputContext(int context_id,
                                         const std::string& text) = 0;
   // Sends the key event to the window tree host.
   virtual bool SendKeyEvent(ui::KeyEvent* ui_event,
@@ skipping 29 matching lines @@
   using RequestMap =
       std::map<std::string,
                std::pair<std::string,
                          ui::IMEEngineHandlerInterface::KeyEventDoneCallback>>;
 
   unsigned int next_request_id_;
   RequestMap request_map_;
 
   // 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.
   bool handling_key_event_;
 };
 
 }  // namespace input_method
 
 #endif  // CHROME_BROWSER_UI_INPUT_METHOD_INPUT_METHOD_ENGINE_BASE_H_