Re-land: Initial skeleton of Accessibility Object Model Phase 1

third_party/WebKit/Source/core/dom/AccessibleNode.idl

Index: third_party/WebKit/Source/core/dom/AccessibleNode.idl
diff --git a/third_party/WebKit/Source/core/dom/AccessibleNode.idl b/third_party/WebKit/Source/core/dom/AccessibleNode.idl
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+// Copyright 2017 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.
+
+// Accessibility Object Model node
+// Explainer: https://github.com/WICG/aom/blob/master/explainer.md
+// Spec: https://wicg.github.io/aom/spec/
+[
+    RuntimeEnabled=AccessibilityObjectModel
+] interface AccessibleNode {
+    attribute DOMString? role;
+    attribute DOMString? label;
+};