Test aria-pressed=mixed on windows

chrome/renderer/resources/extensions/automation/automation_node.js

Index: chrome/renderer/resources/extensions/automation/automation_node.js
diff --git a/chrome/renderer/resources/extensions/automation/automation_node.js b/chrome/renderer/resources/extensions/automation/automation_node.js
index a960f732872fc9bc5c729a4d81900cb8432991ea..55bdf94d74ed0e3ecc63812ec4ece7c359ab29e3 100644
--- a/chrome/renderer/resources/extensions/automation/automation_node.js
+++ b/chrome/renderer/resources/extensions/automation/automation_node.js
@@ -142,6 +142,13 @@ var GetChecked = requireNative('automationInternal').GetChecked;
 /**
  * @param {number} axTreeID The id of the accessibility tree.
  * @param {number} nodeID The id of a node.
+ * @return {string} The pressed state, as undefined, "true", "false" or "mixed".
+ */
+var GetPressed = requireNative('automationInternal').GetPressed;
+
+/**
+ * @param {number} axTreeID The id of the accessibility tree.
+ * @param {number} nodeID The id of a node.
  * @return {string} The role of the node, or undefined if the tree or
  *     node wasn't found.
  */
@@ -294,6 +301,10 @@ AutomationNodeImpl.prototype = {
     return GetChecked(this.treeID, this.id);
   },
 
+  get pressed() {
+    return GetPressed(this.treeID, this.id);
+  },
+
   get location() {
     return GetLocation(this.treeID, this.id);
   },
@@ -1129,6 +1140,7 @@ utils.expose(AutomationNode, AutomationNodeImpl, {
       'isRootNode',
       'role',
       'checked',
+      'pressed',
       'state',
       'location',
       'indexInParent',