Beginning of an accessibility implementation for html_viewer.

mojo/services/html_viewer/ax_provider_impl.h

+// Copyright 2014 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 MOJO_SERVICES_HTML_VIEWER_AX_PROVIDER_IMPL_H_
+#define MOJO_SERVICES_HTML_VIEWER_AX_PROVIDER_IMPL_H_
+
+#include "mojo/public/cpp/bindings/interface_impl.h"
+#include "mojo/services/public/interfaces/accessibility/accessibility.mojom.h"
+
+namespace blink {
+class WebAXObject;
+class WebView;
+}  // namespace blink
+
+namespace mojo {
+
+// Caller must ensure that |web_view| outlives AxProviderImpl.
+class AxProviderImpl : public InterfaceImpl<AxProvider> {
+ public:
+  explicit AxProviderImpl(blink::WebView* web_view);
+  void GetTree(const Callback<void(Array<AxNodePtr> nodes)>& callback) override;
+
+ private:
+  int Populate(const blink::WebAXObject& ax_object,
+               int parent_id,
+               int next_sibling_id,
+               Array<AxNodePtr>* result);
+  AxNodePtr ConvertAxNode(const blink::WebAXObject& ax_object,
+                          int parent_id,
+                          int next_sibling_id);
+
+  blink::WebView* web_view_;
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_SERVICES_HTML_VIEWER_AX_PROVIDER_IMPL_H_