Make ChromeVox use child-index based offsets again for selection.

chrome/browser/resources/chromeos/chromevox/cvox2/background/command_handler.js

 // 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.
 
 /**
  * @fileoverview ChromeVox commands.
  */
 
 goog.provide('CommandHandler');
 
@@ skipping 504 matching lines @@
           output.withString(target.name || '');
       }
       output.go();
       return false;
     case 'readCurrentURL':
       var output = new Output();
       var target = ChromeVoxState.instance.currentRange_.start.node.root;
       output.withString(target.docUrl || '').go();
       return false;
     case 'copy':
-      var textarea = document.createElement('textarea');
-      document.body.appendChild(textarea);
-      textarea.focus();
-      document.execCommand('paste');
-      var clipboardContent = textarea.value;
-      textarea.remove();
-      cvox.ChromeVox.tts.speak(
-          Msgs.getMsg('copy', [clipboardContent]), cvox.QueueMode.FLUSH);
-      ChromeVoxState.instance.pageSel_ = null;
+      window.setTimeout(function() {
+        var textarea = document.createElement('textarea');
+        document.body.appendChild(textarea);
+        textarea.focus();
+        document.execCommand('paste');
+        var clipboardContent = textarea.value;
+        textarea.remove();
+        cvox.ChromeVox.tts.speak(
+            Msgs.getMsg('copy', [clipboardContent]), cvox.QueueMode.FLUSH);
+        ChromeVoxState.instance.pageSel_ = null;
+      }, 20);
       return true;
     case 'toggleSelection':
       if (!ChromeVoxState.instance.pageSel_) {
         ChromeVoxState.instance.pageSel_ = ChromeVoxState.instance.currentRange;
       } else {
         var root = ChromeVoxState.instance.currentRange_.start.node.root;
         if (root && root.anchorObject && root.focusObject) {
           var sel = new cursors.Range(
               new cursors.Cursor(root.anchorObject, root.anchorOffset),
               new cursors.Cursor(root.focusObject, root.focusOffset));
@@ skipping 197 matching lines @@
       break;
   }
   if (announcement) {
     cvox.ChromeVox.tts.speak(
         announcement, cvox.QueueMode.FLUSH,
         cvox.AbstractTts.PERSONALITY_ANNOTATION);
   }
 };
 
 }); //  goog.scope