Parse meta tag that disables ChromeVox content script and forces compat mode.

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 e22cfc8adbbfbb57311f9dab2b08b38c3057ada3..23b4b074033736d18dd6610b01eaf6708148b0d6 100644
--- a/chrome/browser/resources/chromeos/chromevox/chromevox/injected/init_document.js
+++ b/chrome/browser/resources/chromeos/chromevox/chromevox/injected/init_document.js
@@ -83,6 +83,26 @@ cvox.ChromeVox.initDocument = function() {
     return;
   }
 
+  // Look for ChromeVox-specific meta attributes.
+  var disableContentScript = false;
+  document.querySelectorAll('head meta[name="chromevox"]').forEach(

[David Tseng, 2016/06/15 22:50:16]

Could you do: document.head.querySelectorAll(...

[dmazzoni, 2016/06/16 20:00:06]

Done.

+    function(meta) {
+      if (meta.getAttribute('content-script').toLowerCase() == 'no') {

[David Tseng, 2016/06/15 22:50:16]

Check getAttribute('content-script') is non-null.

[dmazzoni, 2016/06/16 20:00:06]

Done.

+        disableContentScript = true;
+      }
+    });
+  if (disableContentScript) {
+    window.console.log('Disabling ChromeVox content script due to meta tag.');
+    var url = location.href;
+    url = url.substring(0, url.indexOf('#')) || url;
+    cvox.ExtensionBridge.send({
+      target: 'next',
+      action: 'enableCompatForUrl',
+      url: url
+    });
+    return;
+  }
+
   cvox.ExtensionBridge.send({
     target: 'next',
     action: 'getIsClassicEnabled',