Use a predicate that isn't so granular during continuous read.

chrome/browser/resources/chromeos/chromevox/chromevox/injected/init_document.js

Index: chrome/browser/resources/chromeos/chromevox/chromevox/injected/init_document.js
diff --git a/chrome/browser/resources/chromeos/chromevox/chromevox/injected/init_document.js b/chrome/browser/resources/chromeos/chromevox/chromevox/injected/init_document.js
index 45e8716094163c0b464e360269cfd7d596bc0daf..e7fcb22ef30c1dba449cd5eec37d389e95588e43 100644
--- a/chrome/browser/resources/chromeos/chromevox/chromevox/injected/init_document.js
+++ b/chrome/browser/resources/chromeos/chromevox/chromevox/injected/init_document.js
@@ -45,13 +45,11 @@ cvox.ChromeVox.MAX_INIT_TIMEOUT_ = 30000;
 
 /**
  * Flag indicating if ChromeVox Classic is enabled based on the Next
- * background page. Initializes to true for non-top level
- * (i.e. iframes) windows. For top level windows, left undefined and
- * set when background page replies.
+ * background page which sends the state at page load.
  * @type {boolean|undefined}
  * @private
  */
-cvox.ChromeVox.isClassicEnabled_ = window.top == window ? undefined : true;

[dmazzoni, 2016/01/20 06:31:05]

Is this from a different patch?

+cvox.ChromeVox.isClassicEnabled_ = undefined;
 
 
 /**
@@ -62,9 +60,14 @@ cvox.ChromeVox.isClassicEnabled_ = window.top == window ? undefined : true;
  */
 cvox.ChromeVox.recallInit_ = function(reason) {
   if (cvox.ChromeVox.initTimeout_ > cvox.ChromeVox.MAX_INIT_TIMEOUT_) {
-    window.console.log(reason +
-        ' Taking too long - giving up.');
-    return;
+    if (cvox.ChromeVox.isClassicEnabled_ !== undefined) {
+      window.console.log(reason +
+          ' Taking too long - giving up.');
+      return;
+    } else {
+      // Default to enabling classic after the timeout.
+      cvox.ChromeVox.isClassicEnabled_ = true;
+    }
   }
   window.console.log(reason +
                      ' Will try again in ' +