Reland r256396 Add views implementation for AXTreeSource.

ui/accessibility/ax_tree_source.h

 // Copyright 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 UI_ACCESSIBILITY_AX_TREE_SOURCE_H_
 #define UI_ACCESSIBILITY_AX_TREE_SOURCE_H_
 
 #include <vector>
 
 #include "ui/accessibility/ax_node_data.h"
 
 namespace ui {
 
 // An AXTreeSource is an abstract interface for a serializable
 // accessibility tree. The tree may be in some other format or
 // may be computed dynamically, but maintains the properties that
 // it's a strict tree, it has a unique id for each node, and all
 // of the accessibility information about a node can be serialized
 // as an AXNodeData. This is the primary interface to use when
 // an accessibility tree will be sent over an IPC before being
 // consumed.
 template<typename AXNodeSource>
-class AX_EXPORT AXTreeSource {
+class AXTreeSource {
  public:
   virtual ~AXTreeSource() {}
 
   // Get the root of the tree.
   virtual AXNodeSource GetRoot() const = 0;
 
   // Get a node by its id. If no node by that id exists in the tree, return a
   // null node, i.e. one that will return false if you call IsValid on it.
   virtual AXNodeSource GetFromId(int32 id) const = 0;
 
@@ skipping 21 matching lines @@
   // Serialize one node in the tree.
   virtual void SerializeNode(AXNodeSource node, AXNodeData* out_data) const = 0;
 
  protected:
   AXTreeSource() {}
 };
 
 }  // namespace ui
 
 #endif  // UI_ACCESSIBILITY_AX_TREE_SOURCE_H_