Forward four more BrowserAccessibility APIs to AXPlatformNode.

ui/views/accessibility/native_view_accessibility_auralinux.cc

Index: ui/views/accessibility/native_view_accessibility_auralinux.cc
diff --git a/ui/views/accessibility/native_view_accessibility_auralinux.cc b/ui/views/accessibility/native_view_accessibility_auralinux.cc
index 316bd4fea3d479e1e988e1c4506ff77ac6b90abc..a5af202bb26472527ac54b1fb9851019f24b2299 100644
--- a/ui/views/accessibility/native_view_accessibility_auralinux.cc
+++ b/ui/views/accessibility/native_view_accessibility_auralinux.cc
@@ -72,6 +72,11 @@ class AuraLinuxApplication
 
   const ui::AXNodeData& GetData() const override { return data_; }
 
+  const ui::AXTreeData& GetTreeData() const override {
+    CR_DEFINE_STATIC_LOCAL(ui::AXTreeData, empty_data, ());
+    return empty_data;
+  }
+
   gfx::NativeWindow GetTopLevelWidget() override { return nullptr; }
 
   gfx::NativeViewAccessible GetParent() override {