Switch from text insertion to key press and release events on the virtual k…

ui/keyboard/resources/api_adapter.js

-// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// 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.
 
 function logIfError() {
   if (chrome.runtime.lastError) {
     console.log(chrome.runtime.lastError);
   }
 }
 
 function insertText(text) {
   chrome.experimental.input.virtualKeyboard.insertText(text, logIfError);
 }
+
+function dispatchKeyEvent(type, char) {
+  if (!char || char.length != 1)
+    console.error('Invalid character.');
+  var charCode = char.charCodeAt(0);
+  chrome.experimental.input.virtualKeyboard.dispatchKeyEvent(type,
+                                                             charCode,
+                                                             logIfError);
+}