Enable Windows UI Automation to expose AXPlatformNodeDelegate::AuthorUniqueId as AutomationId

Author: nicerloop

shell/platform/windows/flutter_window.cc

@@ -811,7 +811,6 @@ LRESULT FlutterWindow::OnGetObject(UINT const message,
   if (root_view) {
     CreateAxFragmentRoot();
     if (is_uia_request) {
-#ifdef FLUTTER_ENGINE_USE_UIA
       // Retrieve UIA object for the root view.
       Microsoft::WRL::ComPtr<IRawElementProviderSimple> root;
       if (SUCCEEDED(
@@ -824,7 +823,6 @@ LRESULT FlutterWindow::OnGetObject(UINT const message,
       } else {
         FML_LOG(ERROR) << "Failed to query AX fragment root.";
       }
-#endif  // FLUTTER_ENGINE_USE_UIA
     } else if (is_msaa_request) {
       // Create the accessibility root if it does not already exist.
       // Return the IAccessible for the root view.

shell/platform/windows/window_unittests.cc

@@ -366,9 +366,7 @@ TEST(MockWindow, DISABLED_GetObjectUia) {
   bool uia_called = false;
   ON_CALL(window, OnGetObject)
       .WillByDefault(Invoke([&uia_called](UINT msg, WPARAM wpar, LPARAM lpar) {
-#ifdef FLUTTER_ENGINE_USE_UIA
         uia_called = true;
-#endif  // FLUTTER_ENGINE_USE_UIA
         return static_cast<LRESULT>(0);
       }));
   EXPECT_CALL(window, OnGetObject).Times(1);