Create GoogleURLTrackerClient interface and //chrome implementation

chrome/browser/google/chrome_google_url_tracker_client.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 CHROME_BROWSER_GOOGLE_CHROME_GOOGLE_URL_TRACKER_CLIENT_H_
+#define CHROME_BROWSER_GOOGLE_CHROME_GOOGLE_URL_TRACKER_CLIENT_H_
+
+#include "components/google/core/browser/google_url_tracker_client.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+
+class ChromeGoogleURLTrackerClient : public GoogleURLTrackerClient,
+                                     public content::NotificationObserver {
+ public:
+  ChromeGoogleURLTrackerClient();
+  virtual ~ChromeGoogleURLTrackerClient();
+
+  // GoogleURLTrackerClient:
+  virtual void SetListeningForNavigationStart(bool listen) OVERRIDE;
+  virtual bool IsListeningForNavigationStart() OVERRIDE;
+
+ private:
+  // content::NotificationObserver:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  content::NotificationRegistrar registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeGoogleURLTrackerClient);
+};
+
+#endif  // CHROME_BROWSER_GOOGLE_CHROME_GOOGLE_URL_TRACKER_CLIENT_H_