Reinstantiate EditableTextHandler instance on focus change.

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

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js b/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
index ebf1edca6e2e73fd595ca8137fce54584440b7d6..c6ecd94ded64426a43adce8819991930e7debe5d 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
@@ -453,6 +453,9 @@ Background.prototype = {
    * @param {Object} evt
    */
   onFocus: function(evt) {
+    // Invalidate any previous editable text handler state.
+    this.editableTextHandler = null;
+
     var node = evt.target;
 
     // It almost never makes sense to place focus directly on a rootWebArea.
@@ -545,6 +548,10 @@ Background.prototype = {
               textChangeEvent.end,
               evt.target.state['protected'],
               cvox.ChromeVox.tts);
+
+      // Ignore the first text selection changed event which gets fired after

[dmazzoni, 2015/09/10 18:46:41]

This shouldn't be necessary once https://codereview.chromium.org/1318683002/
lands

+      // the focus event.
+      return;
     }
 
     this.editableTextHandler.changed(textChangeEvent);