a11y: Allows kListBoxOption as an item to kGroup

This CL adds ListBoxOption role as an item for Group role in
AXNode::SetRoleMatchesItemRole() since Group role could have
ListBoxOption as an item[1]. With this change, when the parent
of ListBoxOption is a group role, PosInSet and SetSize has
proper values.

[1]https://w3c.github.io/aria-practices/examples/listbox/listbox-grouped.html

Bug: 1066632
Change-Id: I23cf0c34ee479d6e8ee33b3f9e327def820527e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2134037
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756360}

ui/accessibility/ax_node.cc

@@ -819,6 +819,7 @@ bool AXNode::SetRoleMatchesItemRole(const AXNode* ordered_set) const {
              item_role == ax::mojom::Role::kListItem ||
              item_role == ax::mojom::Role::kMenuItem ||
              item_role == ax::mojom::Role::kMenuItemRadio ||
+             item_role == ax::mojom::Role::kListBoxOption ||
              item_role == ax::mojom::Role::kTreeItem;
     case ax::mojom::Role::kMenu:
       return item_role == ax::mojom::Role::kMenuItem ||

ui/accessibility/ax_tree_unittest.cc

@@ -3647,6 +3647,43 @@ TEST(AXTreeTest, TestSetSizePosInSetMenuItemValidChildOfMenuListPopup) {
   EXPECT_OPTIONAL_EQ(2, item2->GetSetSize());
 }
 
+TEST(AXTreeTest, TestSetSizePostInSetListBoxOptionWithGroup) {
+  AXTreeUpdate initial_state;
+  initial_state.root_id = 1;
+  initial_state.nodes.resize(7);
+  initial_state.nodes[0].id = 1;
+  initial_state.nodes[0].child_ids = {2, 3};
+  initial_state.nodes[0].role = ax::mojom::Role::kListBox;
+  initial_state.nodes[1].id = 2;
+  initial_state.nodes[1].child_ids = {4, 5};
+  initial_state.nodes[1].role = ax::mojom::Role::kGroup;
+  initial_state.nodes[2].id = 3;
+  initial_state.nodes[2].child_ids = {6, 7};
+  initial_state.nodes[2].role = ax::mojom::Role::kGroup;
+  initial_state.nodes[3].id = 4;
+  initial_state.nodes[3].role = ax::mojom::Role::kListBoxOption;
+  initial_state.nodes[4].id = 5;
+  initial_state.nodes[4].role = ax::mojom::Role::kListBoxOption;
+  initial_state.nodes[5].id = 6;
+  initial_state.nodes[5].role = ax::mojom::Role::kListBoxOption;
+  initial_state.nodes[6].id = 7;
+  initial_state.nodes[6].role = ax::mojom::Role::kListBoxOption;
+  AXTree tree(initial_state);
+
+  AXNode* listbox_option1 = tree.GetFromId(4);
+  EXPECT_OPTIONAL_EQ(1, listbox_option1->GetPosInSet());
+  EXPECT_OPTIONAL_EQ(2, listbox_option1->GetSetSize());
+  AXNode* listbox_option2 = tree.GetFromId(5);
+  EXPECT_OPTIONAL_EQ(2, listbox_option2->GetPosInSet());
+  EXPECT_OPTIONAL_EQ(2, listbox_option2->GetSetSize());
+  AXNode* listbox_option3 = tree.GetFromId(6);
+  EXPECT_OPTIONAL_EQ(1, listbox_option3->GetPosInSet());
+  EXPECT_OPTIONAL_EQ(2, listbox_option3->GetSetSize());
+  AXNode* listbox_option4 = tree.GetFromId(7);
+  EXPECT_OPTIONAL_EQ(2, listbox_option4->GetPosInSet());
+  EXPECT_OPTIONAL_EQ(2, listbox_option4->GetSetSize());
+}
+
 TEST(AXTreeTest, OnNodeWillBeDeletedHasValidUnignoredParent) {
   AXTreeUpdate initial_state;
   initial_state.root_id = 1;