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

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

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/command_handler.js
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/command_handler.js b/chrome/browser/resources/chromeos/chromevox/cvox2/background/command_handler.js
index 4bf888349ae92e06c16f0e3ef46864f8823b9852..776d2b8e8b650a3b17d59c35d53d90ecf1322f05 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/command_handler.js
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/command_handler.js
@@ -509,15 +509,17 @@ CommandHandler.onCommand = function(command) {
       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_) {