Implement AutomationNode.querySelector().

extensions/renderer/api/automation/automation_api_helper.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 EXTENSIONS_RENDERER_API_AUTOMATION_AUTOMATION_API_HELPER_H_
+#define EXTENSIONS_RENDERER_API_AUTOMATION_AUTOMATION_API_HELPER_H_
+
+#include "base/strings/string16.h"
+#include "content/public/renderer/render_view_observer.h"
+
+namespace extensions {
+
+// Renderer-side implementation for chrome.automation API (for the few pieces
+// which aren't built in to the existing accessibility system).
+class AutomationApiHelper : public content::RenderViewObserver {
+ public:
+  explicit AutomationApiHelper(content::RenderView* render_view);
+  ~AutomationApiHelper() override;
+
+ private:
+  // RenderViewObserver implementation.
+  bool OnMessageReceived(const IPC::Message& message) override;
+
+  void OnQuerySelector(int acc_obj_id,
+                       int request_id,
+                       const base::string16& selector);
+
+  DISALLOW_COPY_AND_ASSIGN(AutomationApiHelper);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_RENDERER_API_AUTOMATION_AUTOMATION_API_HELPER_H_