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

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/chromevox_state.js
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/chromevox_state.js b/chrome/browser/resources/chromeos/chromevox/cvox2/background/chromevox_state.js
index 8cbf6bba7f2f8f726114e0dd3943b107a25a3eab..337379713db30ad8bf057cf41dd4ec4b8177729a 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/chromevox_state.js
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/chromevox_state.js
@@ -10,8 +10,10 @@
 
 goog.provide('ChromeVoxMode');
 goog.provide('ChromeVoxState');
+goog.provide('ChromeVoxStateObserver');
 
 goog.require('cursors.Cursor');
+goog.require('cursors.Range');
 
 /**
  * All possible modes ChromeVox can run.
@@ -25,6 +27,20 @@ ChromeVoxMode = {
 };
 
 /**
+ * An interface implemented by objects that want to observe ChromeVox state
+ * changes.
+ * @interface
+ */
+ChromeVoxStateObserver = function() {};
+
+ChromeVoxStateObserver.prototype = {
+  /**
+   * @param {cursors.Range} range The new range.
+   */
+  onCurrentRangeChanged: function(range) {}
+};
+
+/**
  * ChromeVox2 state object.
  * @constructor
  */
@@ -80,5 +96,15 @@ ChromeVoxState.prototype = {
   /**
    * @param {cursors.Range} newRange The new range.
    */
-  setCurrentRange: goog.abstractMethod,
+  setCurrentRange: goog.abstractMethod
+};
+
+/** @type {!Array<ChromeVoxStateObserver>} */
+ChromeVoxState.observers = [];
+
+/**
+ * @param {ChromeVoxStateObserver} observer
+ */
+ChromeVoxState.addObserver = function(observer) {
+  this.observers.push(observer);
 };