Reimplement automation API on top of C++-backed AXTree.

chrome/browser/extensions/api/automation_internal/automation_web_contents_observer.h

+// Copyright 2015 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 CHROME_BROWSER_EXTENSIONS_API_AUTOMATION_INTERNAL_AUTOMATION_WEB_CONTENTS_OBSERVER_H_
+#define CHROME_BROWSER_EXTENSIONS_API_AUTOMATION_INTERNAL_AUTOMATION_WEB_CONTENTS_OBSERVER_H_
+
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/browser/web_contents_user_data.h"
+
+namespace extensions {
+
+// Helper class that receives accessibility data from |WebContents|.
+class AutomationWebContentsObserver
+    : public content::WebContentsObserver,
+      public content::WebContentsUserData<AutomationWebContentsObserver> {
+ public:
+  ~AutomationWebContentsObserver() override {}
+
+  // content::WebContentsObserver overrides.
+  void AccessibilityEventReceived(
+      const std::vector<content::AXEventNotificationDetails>& details)
+      override;
+  void RenderFrameDeleted(
+      content::RenderFrameHost* render_frame_host) override;
+
+ private:
+  friend class content::WebContentsUserData<AutomationWebContentsObserver>;
+
+  explicit AutomationWebContentsObserver(content::WebContents* web_contents);
+
+  content::BrowserContext* browser_context_;
+
+  DISALLOW_COPY_AND_ASSIGN(AutomationWebContentsObserver);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_AUTOMATION_INTERNAL_AUTOMATION_WEB_CONTENTS_OBSERVER_H_