WebUIHandler for chrome://keyboard

ui/keyboard/keyboard_util.h

 // Copyright (c) 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 UI_KEYBOARD_KEYBOARD_UTIL_H_
 #define UI_KEYBOARD_KEYBOARD_UTIL_H_
 
+#include <string>
+
 #include "ui/keyboard/keyboard_export.h"
 
+namespace base {
+class ListValue;
+}
+
+namespace ui {
+class KeyEvent;
+}
+
 namespace keyboard {
 
 // Returns true if the virtual keyboard is enabled.
 KEYBOARD_EXPORT bool IsKeyboardEnabled();
 
+// Creates a ui::KeyEvent from the argument base::ListValue that is passed to
+// the synthetic input APIs (either the Extension API or the WebUI API).  The
+// returned ui::KeyEvent is owned by the caller.  If an error occurs, NULL is
+// returned and |error| will be populated with a description of the error.  For
+// a description of the expected input, please see
+// chrome/common/extensions/api/experimental_input_virtual_keyboard.json
+KEYBOARD_EXPORT ui::KeyEvent* KeyEventFromArgs(const base::ListValue* args,
+                                               std::string* error);
+
 }  // namespace keyboard
 
 #endif  // UI_KEYBOARD_KEYBOARD_UTIL_H_