Create GoogleURLTrackerClient interface and //chrome implementation

chrome/browser/google/chrome_google_url_tracker_client.cc

+// 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.
+
+#include "chrome/browser/google/chrome_google_url_tracker_client.h"
+
+#include "chrome/browser/chrome_notification_types.h"
+#include "chrome/browser/google/google_url_tracker.h"
+#include "chrome/browser/infobars/infobar_service.h"
+#include "content/public/browser/navigation_controller.h"
+#include "content/public/browser/navigation_entry.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/web_contents.h"
+
+ChromeGoogleURLTrackerClient::ChromeGoogleURLTrackerClient() {
+}
+
+ChromeGoogleURLTrackerClient::~ChromeGoogleURLTrackerClient() {
+}
+
+void ChromeGoogleURLTrackerClient::SetListeningForNavigationStart(bool listen) {
+  if (listen) {
+    registrar_.Add(
+        this,
+        content::NOTIFICATION_NAV_ENTRY_PENDING,
+        content::NotificationService::AllBrowserContextsAndSources());
+  } else {
+    registrar_.Remove(
+        this,
+        content::NOTIFICATION_NAV_ENTRY_PENDING,
+        content::NotificationService::AllBrowserContextsAndSources());
+  }
+}
+
+bool ChromeGoogleURLTrackerClient::IsListeningForNavigationStart() {
+  return registrar_.IsRegistered(
+      this,
+      content::NOTIFICATION_NAV_ENTRY_PENDING,
+      content::NotificationService::AllBrowserContextsAndSources());
+}
+
+void ChromeGoogleURLTrackerClient::Observe(
+    int type,
+    const content::NotificationSource& source,
+    const content::NotificationDetails& details) {
+  DCHECK_EQ(content::NOTIFICATION_NAV_ENTRY_PENDING, type);
+  content::NavigationController* controller =
+      content::Source<content::NavigationController>(source).ptr();
+  InfoBarService* infobar_service =
+      InfoBarService::FromWebContents(controller->GetWebContents());
+  // Because we're listening to all sources, there may be no
+  // InfoBarService for some notifications, e.g. navigations in
+  // bubbles/balloons etc.
+  if (infobar_service) {
+    google_url_tracker()->OnNavigationPending(
+        controller,
+        infobar_service,
+        controller->GetPendingEntry()->GetUniqueID());
+  }
+}