Implement the webNavigation.onCommitted event.

chrome/browser/extensions/extension_webnavigation_api.h

Index: chrome/browser/extensions/extension_webnavigation_api.h
diff --git a/chrome/browser/extensions/extension_webnavigation_api.h b/chrome/browser/extensions/extension_webnavigation_api.h
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+++ b/chrome/browser/extensions/extension_webnavigation_api.h
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+// Copyright (c) 2010 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.
+
+// Defines the Chrome Extensions WebNavigation API functions for observing and
+// intercepting navigation events, as specified in
+// chrome/common/extensions/api/extension_api.json.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBNAVIGATION_API_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBNAVIGATION_API_H_
+#pragma once
+
+#include "base/singleton.h"
+#include "chrome/browser/extensions/extension_function.h"
+#include "chrome/browser/tab_contents/navigation_controller.h"
+#include "chrome/common/notification_registrar.h"
+#include "googleurl/src/gurl.h"
+
+// Observes navigation notifications and routes them as events to the extension
+// system.
+class ExtensionWebNavigationEventRouter : public NotificationObserver {
+ public:
+  // Single instance of the event router.
+  static ExtensionWebNavigationEventRouter* GetInstance();
+
+  void Init();
+
+ private:
+  friend struct DefaultSingletonTraits<ExtensionWebNavigationEventRouter>;
+
+  ExtensionWebNavigationEventRouter() {}
+  virtual ~ExtensionWebNavigationEventRouter() {}
+
+  // NotificationObserver implementation.
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
+  // Handler for the NAV_ENTRY_COMMITTED event. The method takes the details of
+  // such an event and constructs a suitable JSON formatted extension event
+  // from it.
+  void NavEntryCommitted(NavigationController* controller,
+                         NavigationController::LoadCommittedDetails* details);
+
+  // This method dispatches events to the extension message service.
+  void DispatchEvent(Profile* context,
+                     const char* event_name,
+                     const std::string& json_args);
+
+  // Used for tracking registrations to navigation notifications.
+  NotificationRegistrar registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionWebNavigationEventRouter);
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBNAVIGATION_API_H_