Forward four more BrowserAccessibility APIs to AXPlatformNode.

ui/views/accessibility/native_view_accessibility_base.cc

Index: ui/views/accessibility/native_view_accessibility_base.cc
diff --git a/ui/views/accessibility/native_view_accessibility_base.cc b/ui/views/accessibility/native_view_accessibility_base.cc
index 3eca6e3b583ff4e9441573389617d021df0e63c2..3b5789ffab8d1e388043703095ee0823adb1e951 100644
--- a/ui/views/accessibility/native_view_accessibility_base.cc
+++ b/ui/views/accessibility/native_view_accessibility_base.cc
@@ -97,6 +97,11 @@ const ui::AXNodeData& NativeViewAccessibilityBase::GetData() const {
   return data_;
 }
 
+const ui::AXTreeData& NativeViewAccessibilityBase::GetTreeData() const {
+  CR_DEFINE_STATIC_LOCAL(ui::AXTreeData, empty_data, ());
+  return empty_data;
+}
+
 int NativeViewAccessibilityBase::GetChildCount() {
   int child_count = view_->child_count();