Wire AccessibilityNodeInfo.getTooltipText to Automation API

Bug: b/77884420
Test: Manual
Change-Id: Ia33a44e09ad29fbfc989f9f4d22d7ff92d023c6f
Reviewed-on: https://chromium-review.googlesource.com/1092394
Commit-Queue: Sara Kato <sarakato@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567557}

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

@@ -403,6 +403,16 @@ void AXTreeSourceArc::SerializeNode(AXNodeInfoData* node,
     }
   }
 
+  // If it exists, set tooltip value as descritiption on node.
+  std::string tooltip;
+  if (GetProperty(node, AXStringProperty::TOOLTIP, &tooltip)) {
+    out_data->AddStringAttribute(ax::mojom::StringAttribute::kDescription,
+                                 tooltip);
+    if (GetProperty(node, AXStringProperty::TEXT, &name)) {
+      out_data->SetName(name);
+    }
+  }
+
   if (has_name) {
     if (out_data->role == ax::mojom::Role::kTextField)
       out_data->AddStringAttribute(ax::mojom::StringAttribute::kValue, name);

components/arc/common/accessibility_helper.mojom

@@ -119,7 +119,8 @@ enum AccessibilityStringProperty {
   CONTENT_DESCRIPTION,
   VIEW_ID_RESOURCE_NAME,
   CHROME_ROLE,  // Chrome only
-  ROLE_DESCRIPTION  // Chrome only
+  ROLE_DESCRIPTION,  // Chrome only
+  TOOLTIP
 };
 
 // These fields are taken from int instance members of