Index: chrome/browser/engagement/site_engagement_observer.h |
diff --git a/chrome/browser/engagement/site_engagement_observer.h b/chrome/browser/engagement/site_engagement_observer.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..c3644bf46813cd15104dce45d595aac2421e97b2 |
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+++ b/chrome/browser/engagement/site_engagement_observer.h |
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+// 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. |
+ |
+#ifndef CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_OBSERVER_H_ |
+#define CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_OBSERVER_H_ |
+ |
+#include "base/gtest_prod_util.h" |
+#include "base/macros.h" |
+ |
+namespace content { |
+class WebContents; |
+} |
+ |
+class GURL; |
+class SiteEngagementService; |
+ |
+class SiteEngagementObserver { |
+ public: |
+ // Called when the engagement for |url| loaded in |web_contents| increases to |
+ // |score|. |is_hidden| is true if the engagement occurred when |web_contents| |
+ // was hidden (e.g. in the background). |
+ // This method may be run on user input, so observers *must not* perform any |
+ // expensive tasks here. |
+ virtual void OnEngagementIncreased(content::WebContents* web_contents, |
+ const GURL& url, |
+ double score) {} |
+ |
+ protected: |
+ explicit SiteEngagementObserver(SiteEngagementService* service); |
+ |
+ SiteEngagementObserver(); |
+ |
+ ~SiteEngagementObserver(); |
+ |
+ // Returns the site engagement service which this object is observing. |
+ SiteEngagementService* GetSiteEngagementService() const; |
+ |
+ // Begin observing |service| for engagement increases. |
+ // To stop observing, call Observe(nullptr). |
+ void Observe(SiteEngagementService* service); |
+ |
+ private: |
+ FRIEND_TEST_ALL_PREFIXES(SiteEngagementServiceTest, Observers); |
+ SiteEngagementService* service_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(SiteEngagementObserver); |
+}; |
+ |
+#endif // CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_OBSERVER_H_ |