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

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

 // Copyright 2014 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 The entry point for all ChromeVox2 related code for the
  * background page.
  */
 
 goog.provide('Background');
@@ skipping 33 matching lines @@
 
   /**
    * A list of site substring patterns to use with ChromeVox next. Keep these
    * strings relatively specific.
    * @type {!Array<string>}
    * @private
    */
   this.whitelist_ = ['chromevox_next_test'];
 
   /**
+   * A list of site substring patterns to blacklist ChromeVox Classic,
+   * putting ChromeVox into Compat mode.
+   * @type {!Array<string>}
+   * @private
+   */
+  this.classicBlacklist_ = [];
+
+  /**
    * Regular expression for blacklisting classic.
    * @type {RegExp}
    * @private
    */
   this.classicBlacklistRegExp_ = Background.globsToRegExp_(
       chrome.runtime.getManifest()['content_scripts'][0]['exclude_globs']);
 
   /**
    * @type {cursors.Range}
    * @private
@@ skipping 931 matching lines @@
         !this.isBlacklistedForClassic_(url) &&
         !this.isWhitelistedForNext_(url);
   },
 
   /**
    * @param {string} url
    * @return {boolean}
    * @private
    */
   isBlacklistedForClassic_: function(url) {
-    return this.classicBlacklistRegExp_.test(url);
+    if (this.classicBlacklistRegExp_.test(url))
+      return true;
+    return this.classicBlacklist_.some(function(item) {
+      return url.indexOf(item) != -1;
+    });
   },
 
   /**
    * @param {string} url
    * @return {boolean} Whether the given |url| is whitelisted.
    * @private
    */
   isWhitelistedForNext_: function(url) {
     return this.whitelist_.some(function(item) {
       return url.indexOf(item) != -1;
@@ skipping 52 matching lines @@
 
     switch (target) {
       case 'next':
         if (action == 'getIsClassicEnabled') {
           var url = msg['url'];
           var isClassicEnabled = this.shouldEnableClassicForUrl_(url);
           port.postMessage({
             target: 'next',
             isClassicEnabled: isClassicEnabled
           });
+        } else if (action == 'enableCompatForUrl') {
+          var url = msg['url'];
+          this.classicBlacklist_.push(url);

[David Tseng, 2016/06/15 22:50:17]

Should be a dictionary/set since we don't want dups.

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

Done.

+          if (this.currentRange_ && this.currentRange_.start.node)
+            this.refreshMode(this.currentRange_.start.node);
         } else if (action == 'onCommand') {
           this.onGotCommand(msg['command']);
         } else if (action == 'flushNextUtterance') {
           Output.flushNextSpeechUtterance();
         }
         break;
     }
   },
 
   /**
@@ skipping 106 matching lines @@
     return glob.replace(/[.+^$(){}|[\]\\]/g, '\\$&')
         .replace(/\*/g, '.*')
         .replace(/\?/g, '.');
   }).join('|') + ')$');
 };
 
 /** @type {Background} */
 global.backgroundObj = new Background();
 
 });  // goog.scope