Wire window title to ARC root node's name property

Previously, when the root node in ARC gets focus from ChromeVox,
ChromeVox reads the entire window content.

This CL prevents it by assigning the window title to the root node.

Bug: None (preparation of b:148356674)
Test: unit_tests --gtest_filter="AXTreeSourceArcTest.*"
Change-Id: I884e2c19188468c48f6c26a4d4cb3eb72dc31144
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2024635
Commit-Queue: Hiroki Sato <hirokisato@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Sara Kato <sarakato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736766}

chrome/browser/chromeos/arc/accessibility/accessibility_node_info_data_wrapper.cc

@@ -352,6 +352,19 @@ void AccessibilityNodeInfoDataWrapper::Serialize(
     ComputeNameFromContents(this, &names);
     if (!names.empty())
       out_data->SetName(base::JoinString(names, " "));
+  } else if (is_node_tree_root) {
+    AccessibilityInfoDataWrapper* parent =
+        tree_source_->GetParent(tree_source_->GetFromId(node_ptr_->id));
+    if (parent && parent->GetWindow()) {
+      std::string title;
+      if (arc::GetProperty(parent->GetWindow()->string_properties,
+                           mojom::AccessibilityWindowStringProperty::TITLE,
+                           &title) &&
+          !title.empty()) {
+        out_data->SetName(title);
+        out_data->SetNameFrom(ax::mojom::NameFrom::kTitle);
+      }
+    }
   }
 
   std::string role_description;

chrome/browser/chromeos/arc/accessibility/ax_tree_source_arc_unittest.cc

@@ -513,6 +513,15 @@ TEST_F(AXTreeSourceArcTest, AccessibleNameComputation) {
   CallSerializeNode(root, &data);
   ASSERT_FALSE(
       data->GetStringAttribute(ax::mojom::StringAttribute::kName, &name));
+
+  // Root window title propagates to the name of the root node of the window if
+  // it isn't specified.
+  SetProperty(root_window, AXWindowStringProperty::TITLE, "Window Title");
+  CallNotifyAccessibilityEvent(event.get());
+  CallSerializeNode(root, &data);
+  ASSERT_TRUE(
+      data->GetStringAttribute(ax::mojom::StringAttribute::kName, &name));
+  ASSERT_EQ("Window Title", name);
 }
 
 TEST_F(AXTreeSourceArcTest, AccessibleNameComputationTextField) {