Forward four more BrowserAccessibility APIs to AXPlatformNode.

ui/views/accessibility/native_view_accessibility_auralinux.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/accessibility/native_view_accessibility_auralinux.h"
 
 #include <algorithm>
 #include <memory>
 #include <vector>
 
@@ skipping 54 matching lines @@
   void OnWidgetDestroying(Widget* widget) override {
     auto iter = std::find(widgets_.begin(), widgets_.end(), widget);
     if (iter != widgets_.end())
       widgets_.erase(iter);
   }
 
   // ui::AXPlatformNodeDelegate:
 
   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 {
     return nullptr;
   }
 
   int GetChildCount() override {
     return static_cast<int>(widgets_.size());
   }
 
@@ skipping 74 matching lines @@
 }
 
 gfx::NativeViewAccessible NativeViewAccessibilityAuraLinux::GetParent() {
   gfx::NativeViewAccessible parent = NativeViewAccessibilityBase::GetParent();
   if (!parent)
     parent = AuraLinuxApplication::GetInstance()->GetNativeViewAccessible();
   return parent;
 }
 
 }  // namespace views