Adds the legacy KeyboardEvent.keyCode attribute for extension IMEs.

chrome/browser/chromeos/input_method/input_method_engine_interface.h

 // Copyright 2013 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_CHROMEOS_INPUT_METHOD_INPUT_METHOD_ENGINE_INTERFACE_H_
 #define CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_ENGINE_INTERFACE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 12 matching lines @@
 // API.
 class InputMethodEngineInterface : public IMEEngineHandlerInterface {
  public:
   struct KeyboardEvent {
     KeyboardEvent();
     virtual ~KeyboardEvent();
 
     std::string type;
     std::string key;
     std::string code;
+    int key_code; // only used by on-screen keyboards.
     std::string extension_id;
     bool alt_key;
     bool ctrl_key;
     bool shift_key;
     bool caps_lock;
   };
 
   enum {
     MENU_ITEM_MODIFIED_LABEL        = 0x0001,
     MENU_ITEM_MODIFIED_STYLE        = 0x0002,
@@ skipping 203 matching lines @@
                                      size_t number_of_chars,
                                      std::string* error) = 0;
 
   // Hides the input view window (from API call).
   virtual void HideInputView() = 0;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_ENGINE_INTERFACE_H_