[Switch Access] Make Chrome menu openable again

The Chrome menu (the three dots at the right of the omnibar) stopped
being openable recently, because it shows up as a combo box. Modify
the combo box behavior to allow for some elements detected as combo
boxes to not be combo boxes.

This is a temporary fix; the long-term fix is to properly populate
the location for combo box pop-up windows.

AX-Relnotes: n/a.
Bug: 1106529
Change-Id: Ica0494ce85246abb73efb899d15abad38d700ebb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2300982
Commit-Queue: Anastasia Helfinstein <anastasi@google.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791477}

chrome/browser/resources/chromeos/accessibility/switch_access/nodes/combo_box_node.js

@@ -9,12 +9,13 @@
 class ComboBoxNode extends NodeWrapper {
   /** @override */
   get actions() {
-    return [SwitchAccessMenuAction.INCREMENT, SwitchAccessMenuAction.DECREMENT];
+    const actions = super.actions;
+    if (!actions.includes(SwitchAccessMenuAction.INCREMENT) &&
+        !actions.includes(SwitchAccessMenuAction.DECREMENT)) {
+      actions.push(
+          SwitchAccessMenuAction.INCREMENT, SwitchAccessMenuAction.DECREMENT);
     }
-
-  /** @override */
-  doDefaultAction() {
-    this.performAction(SwitchAccessMenuAction.INCREMENT);
+    return actions;
   }
 
   /** @override */
@@ -26,8 +27,8 @@ class ComboBoxNode extends NodeWrapper {
   /** @override */
   performAction(action) {
     // The box of options that typically pops up with combo boxes is not
-    // currently represented in the automation tree, so we work around that by
-    // selecting a value without opening the pop-up, using the up and down
+    // currently given a location in the automation tree, so we work around that
+    // by selecting a value without opening the pop-up, using the up and down
     // arrows.
     switch (action) {
       case SwitchAccessMenuAction.DECREMENT:
@@ -37,6 +38,6 @@ class ComboBoxNode extends NodeWrapper {
         EventHelper.simulateKeyPress(EventHelper.KeyCode.DOWN_ARROW);
         return SAConstants.ActionResponse.REMAIN_OPEN;
     }
-    return SAConstants.ActionResponse.NO_ACTION_TAKEN;
+    return super.performAction(action);
   }
 }

chrome/browser/resources/chromeos/accessibility/switch_access/switch_access_predicate.js

@@ -119,9 +119,6 @@ const SwitchAccessPredicate = {
     if (node.state[StateType.INVISIBLE]) {
       return false;
     }
-    if (AutomationPredicate.comboBox(node)) {
-      return false;
-    }
 
     if (node.role === chrome.automation.RoleType.KEYBOARD) {
       return true;