Index: chrome/browser/engagement/site_engagement_observer.cc |
diff --git a/chrome/browser/engagement/site_engagement_observer.cc b/chrome/browser/engagement/site_engagement_observer.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..020ce792a579afd26c7ecea7fa266f9b37f57bda |
--- /dev/null |
+++ b/chrome/browser/engagement/site_engagement_observer.cc |
@@ -0,0 +1,31 @@ |
+// Copyright 2016 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/engagement/site_engagement_observer.h" |
+ |
+#include "chrome/browser/engagement/site_engagement_service.h" |
+ |
+SiteEngagementObserver::SiteEngagementObserver(SiteEngagementService* service) |
+ : service_(nullptr) { |
+ Observe(service); |
+} |
+ |
+SiteEngagementObserver::SiteEngagementObserver() : service_(nullptr) {} |
+ |
+SiteEngagementObserver::~SiteEngagementObserver() { |
+ if (service_) |
+ service_->RemoveObserver(this); |
+} |
+ |
+void SiteEngagementObserver::Observe(SiteEngagementService* service) { |
+ if (service == service_) |
+ return; |
+ |
+ if (service_) |
+ service_->RemoveObserver(this); |
+ |
+ service_ = service; |
+ if (service_) |
+ service->AddObserver(this); |
+} |