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 491 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() {

[dmazzoni, 2016/10/05 18:25:33]

Have you looked into this API, would it work?

https://developer.chrome.com/apps/clipboard

[David Tseng, 2016/10/10 20:03:21]

This didn't work for me when I first tried it a while ago. 

Wasted some time trying to figure out why it wasn't working...looks like only
platform apps have clipboard perms and only on dev. Tried to whitelist
ChromeVox, but no go. Guessing I'm missing something along the way, but
considering the api is still in dev, let's re-visit when it actually works.

+        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 179 matching lines @@
       break;
   }
   if (announcement) {
     cvox.ChromeVox.tts.speak(
         announcement, cvox.QueueMode.FLUSH,
         cvox.AbstractTts.PERSONALITY_ANNOTATION);
   }
 };
 
 }); //  goog.scope