Add a |contentEquals| method to cursors and ranges.

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

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/cursors.js
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/cursors.js b/chrome/browser/resources/chromeos/chromevox/cvox2/background/cursors.js
index 974e0a4f0d7313363085ca4bd8f2a114a191d849..074cbdac315723cea6103eacd38debeb5420d18d 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/cursors.js
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/cursors.js
@@ -97,6 +97,7 @@ cursors.Cursor.fromNode = function(node) {
 cursors.Cursor.prototype = {
   /**
    * Returns true if |rhs| is equal to this cursor.
+   * Use this for strict equality between cursors.
    * @param {!cursors.Cursor} rhs
    * @return {boolean}
    */
@@ -106,6 +107,30 @@ cursors.Cursor.prototype = {
   },
 
   /**
+   * Returns true if |rhs| is equal to this cursor.
+   * Use this for loose equality between cursors where specific character-based
+   * indicies do not matter such as when processing node-targeted events.
+   * @param {!cursors.Cursor} rhs
+   * @return {boolean}
+   */
+  contentEquals: function(rhs) {
+    // First, normalize the two nodes so they both point to the first non-text
+    // node.
+    var lNode = this.node;
+    var rNode = rhs.node;
+    while (lNode && (lNode.role == RoleType.inlineTextBox ||
+        lNode.role == RoleType.staticText))
+      lNode = lNode.parent;
+    while (rNode && (rNode.role == RoleType.inlineTextBox ||
+        rNode.role == RoleType.staticText))
+      rNode = rNode.parent;
+
+    // Ignore indicies for now.
+
+    return lNode === rNode && lNode != undefined;
+  },
+
+  /**
    * Returns the node. If the node is invalid since the last time it
    * was accessed, moves the cursor to the nearest valid ancestor first.
    * @return {AutomationNode}
@@ -480,6 +505,7 @@ cursors.Range.getDirection = function(rangeA, rangeB) {
 cursors.Range.prototype = {
   /**
    * Returns true if |rhs| is equal to this range.
+   * Use this for strict equality between ranges.
    * @param {!cursors.Range} rhs
    * @return {boolean}
    */
@@ -489,6 +515,17 @@ cursors.Range.prototype = {
   },
 
   /**
+   * Returns true if |rhs| is equal to this range.
+   * Use this for loose equality between ranges.
+   * @param {!cursors.Range} rhs
+   * @return {boolean}
+   */
+  contentEquals: function(rhs) {
+    return this.start_.contentEquals(rhs.start) &&
+        this.end_.contentEquals(rhs.end);
+  },
+
+  /**
    * Gets a cursor bounding this range.
    * @param {Dir} dir Which endpoint cursor to return; Dir.FORWARD for end,
    * Dir.BACKWARD for start.