First step to move common accessibility code out of content.

content/public/common/ax_node.h

Index: content/public/common/ax_node.h
diff --git a/content/public/common/ax_node.h b/content/public/common/ax_node.h
new file mode 100644
index 0000000000000000000000000000000000000000..ce0f0113dbda760329e9b6911e177a20f591f633
--- /dev/null
+++ b/content/public/common/ax_node.h
@@ -0,0 +1,33 @@
+// Copyright (c) 2013 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.
+
+#ifndef CONTENT_PUBLIC_COMMON_AX_NODE_H_
+#define CONTENT_PUBLIC_COMMON_AX_NODE_H_
+
+#include "content/public/common/ax_node_data.h"
+
+namespace content {
+
+class AXTree;
+
+// One node in an AXTree. The accessibility information is all in
+// data(); the rest of the interface is to walk the tree.
+class CONTENT_EXPORT AXNode {
+ public:
+  // Accessors.
+  virtual int32 GetId() const = 0;
+  virtual AXNode* GetParent() const = 0;
+  virtual int GetChildCount() const = 0;
+  virtual AXNode* ChildAtIndex(int index) const = 0;
+  virtual const AXNodeData& data() const = 0;
+
+ protected:
+  AXNode();
+  virtual ~AXNode();
+};
+
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_COMMON_AX_NODE_H_