Forward accessibility events to the automation extension process.

chrome/browser/extensions/api/automation_internal/automation_event_router.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_EVENT_ROUTER_H_
+#define CHROME_BROWSER_EXTENSIONS_API_AUTOMATION_INTERNAL_AUTOMATION_EVENT_ROUTER_H_
+
+#include <vector>
+
+#include "base/containers/hash_tables.h"
+#include "base/memory/singleton.h"
+#include "chrome/common/extensions/api/automation_internal.h"
+#include "content/public/browser/ax_event_notification_details.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "extensions/common/extension.h"
+
+namespace content {
+class BrowserContext;
+}  // namespace content
+
+struct ExtensionMsg_AccessibilityEventParams;
+
+namespace extensions {
+
+struct AutomationListener;
+
+class AutomationEventRouter : public content::NotificationObserver {
+ public:
+  static AutomationEventRouter* GetInstance();
+
+  void AddListener(ExtensionId extension_id,

[not at google - send to devlin, 2015/06/02 23:59:24]

mention when it's removed.

[dmazzoni, 2015/06/04 20:07:39]

Done. Note that the current automation API doesn't seem to have a way to stop
listening. Maybe we should add it, but for now I'm just trying to reimplement
what's already there.

+                   int ax_tree_id,
+                   int process_id,
+                   int routing_id,
+                   bool desktop);
+
+  void DispatchAccessibilityEventToAutomation(
+      const ExtensionMsg_AccessibilityEventParams& params);
+
+  void DispatchTreeDestroyedEventToAutomation(
+      int process_id,
+      int routing_id,
+      content::BrowserContext* browser_context);
+
+ private:
+  AutomationEventRouter();
+  ~AutomationEventRouter() override;
+
+  // content::NotificationObserver interface.
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
+
+  content::NotificationRegistrar registrar_;
+  base::hash_map<ExtensionId, AutomationListener*> listener_map_;
+
+  friend struct DefaultSingletonTraits<AutomationEventRouter>;
+
+  DISALLOW_COPY_AND_ASSIGN(AutomationEventRouter);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_AUTOMATION_INTERNAL_AUTOMATION_EVENT_ROUTER_H_