diff --git a/shell/platform/common/flutter_platform_node_delegate.h b/shell/platform/common/flutter_platform_node_delegate.h
index f28cd9181e3bc..2878fe45afe92 100644
--- a/shell/platform/common/flutter_platform_node_delegate.h
+++ b/shell/platform/common/flutter_platform_node_delegate.h
@@ -98,6 +98,9 @@ class FlutterPlatformNodeDelegate : public ui::AXPlatformNodeDelegateBase {
   // |ui::AXPlatformNodeDelegateBase|
   virtual ~FlutterPlatformNodeDelegate() override;
 
+  // |ui::AXPlatformNodeDelegateBase|
+  const ui::AXUniqueId& GetUniqueId() const override { return unique_id_; }
+
   // |ui::AXPlatformNodeDelegateBase|
   const ui::AXNodeData& GetData() const override;
 
@@ -144,6 +147,7 @@ class FlutterPlatformNodeDelegate : public ui::AXPlatformNodeDelegateBase {
  private:
   ui::AXNode* ax_node_;
   std::weak_ptr<OwnerBridge> bridge_;
+  ui::AXUniqueId unique_id_;
 };
 
 }  // namespace flutter
diff --git a/shell/platform/common/flutter_platform_node_delegate_unittests.cc b/shell/platform/common/flutter_platform_node_delegate_unittests.cc
index d6aecb2c61cc0..62a1b22487849 100644
--- a/shell/platform/common/flutter_platform_node_delegate_unittests.cc
+++ b/shell/platform/common/flutter_platform_node_delegate_unittests.cc
@@ -12,6 +12,34 @@
 namespace flutter {
 namespace testing {
 
+TEST(FlutterPlatformNodeDelegateTest, NodeDelegateHasUniqueId) {
+  TestAccessibilityBridgeDelegate* delegate =
+      new TestAccessibilityBridgeDelegate();
+  std::unique_ptr<TestAccessibilityBridgeDelegate> ptr(delegate);
+  std::shared_ptr<AccessibilityBridge> bridge =
+      std::make_shared<AccessibilityBridge>(std::move(ptr));
+
+  // Add node 0: root.
+  FlutterSemanticsNode node0{sizeof(FlutterSemanticsNode), 0};
+  std::vector<int32_t> node0_children{1};
+  node0.child_count = node0_children.size();
+  node0.children_in_traversal_order = node0_children.data();
+  node0.children_in_hit_test_order = node0_children.data();
+
+  // Add node 1: text child of node 0.
+  FlutterSemanticsNode node1{sizeof(FlutterSemanticsNode), 1};
+  node1.label = "prefecture";
+  node1.value = "Kyoto";
+
+  bridge->AddFlutterSemanticsNodeUpdate(&node0);
+  bridge->AddFlutterSemanticsNodeUpdate(&node1);
+  bridge->CommitUpdates();
+
+  auto node0_delegate = bridge->GetFlutterPlatformNodeDelegateFromID(0).lock();
+  auto node1_delegate = bridge->GetFlutterPlatformNodeDelegateFromID(1).lock();
+  EXPECT_TRUE(node0_delegate->GetUniqueId() != node1_delegate->GetUniqueId());
+}
+
 TEST(FlutterPlatformNodeDelegateTest, canPerfomActions) {
   TestAccessibilityBridgeDelegate* delegate =
       new TestAccessibilityBridgeDelegate();
diff --git a/shell/platform/windows/accessibility_bridge_delegate_win32_unittests.cc b/shell/platform/windows/accessibility_bridge_delegate_win32_unittests.cc
index 8afc6351de42d..78a4a528f522c 100644
--- a/shell/platform/windows/accessibility_bridge_delegate_win32_unittests.cc
+++ b/shell/platform/windows/accessibility_bridge_delegate_win32_unittests.cc
@@ -193,21 +193,6 @@ TEST(AccessibilityBridgeDelegateWin32, GetParentOnRootRetunsNullptr) {
   ASSERT_TRUE(node0_delegate->GetParent() == nullptr);
 }
 
-TEST(AccessibilityBridgeDelegateWin32, NodeDelegateHasUniqueId) {
-  auto window_binding_handler =
-      std::make_unique<::testing::NiceMock<MockWindowBindingHandler>>();
-  FlutterWindowsView view(std::move(window_binding_handler));
-  view.SetEngine(GetTestEngine());
-  view.OnUpdateSemanticsEnabled(true);
-
-  auto bridge = view.GetEngine()->accessibility_bridge().lock();
-  PopulateAXTree(bridge);
-
-  auto node0_delegate = bridge->GetFlutterPlatformNodeDelegateFromID(0).lock();
-  auto node1_delegate = bridge->GetFlutterPlatformNodeDelegateFromID(1).lock();
-  EXPECT_TRUE(node0_delegate->GetUniqueId() != node1_delegate->GetUniqueId());
-}
-
 TEST(AccessibilityBridgeDelegateWin32, DispatchAccessibilityAction) {
   auto window_binding_handler =
       std::make_unique<::testing::NiceMock<MockWindowBindingHandler>>();
diff --git a/shell/platform/windows/flutter_platform_node_delegate_win32.h b/shell/platform/windows/flutter_platform_node_delegate_win32.h
index 2b36f7aff460d..3fd1aef71bdee 100644
--- a/shell/platform/windows/flutter_platform_node_delegate_win32.h
+++ b/shell/platform/windows/flutter_platform_node_delegate_win32.h
@@ -35,8 +35,6 @@ class FlutterPlatformNodeDelegateWin32 : public FlutterPlatformNodeDelegate {
       const ui::AXClippingBehavior clipping_behavior,
       ui::AXOffscreenResult* offscreen_result) const override;
 
-  const ui::AXUniqueId& GetUniqueId() const override { return unique_id_; }
-
   // Dispatches a Windows accessibility event of the specified type, generated
   // by the accessibility node associated with this object. This is a
   // convenience wrapper around |NotifyWinEvent|.
@@ -49,7 +47,6 @@ class FlutterPlatformNodeDelegateWin32 : public FlutterPlatformNodeDelegate {
  private:
   ui::AXPlatformNode* ax_platform_node_;
   FlutterWindowsEngine* engine_;
-  ui::AXUniqueId unique_id_;
 };
 
 }  // namespace flutter