Use the site engagement eviction policy for temporary storage eviction.

chrome/browser/engagement/site_engagement_service.h

 // Copyright 2015 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_SERVICE_H_
 #define CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_SERVICE_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/time/default_clock.h"
 #include "base/time/time.h"
 #include "components/keyed_service/core/keyed_service.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 class GURL;
 class Profile;
+class SiteEngagementEvictionPolicy;
 
 class SiteEngagementScore {
  public:
   // Keys used in the content settings dictionary.
   static const char* kRawScoreKey;
   static const char* kPointsAddedTodayKey;
   static const char* kLastEngagementTimeKey;
 
   // The maximum number of points that are allowed.
   static const double kMaxPoints;
@@ skipping 71 matching lines @@
 //
 // Positive user activity, such as visiting the origin often and adding it to
 // the homescreen, will increase the site engagement score. Negative activity,
 // such as rejecting permission prompts or not responding to notifications, will
 // decrease the site engagement score.
 class SiteEngagementService : public KeyedService,
                               public SiteEngagementScoreProvider {
  public:
   static SiteEngagementService* Get(Profile* profile);
 
-  // Returns whether or not the SiteEngagementService is enabled.
+  // Returns whether or not the SiteEngagementService is enabled. Enabling
+  // dependent features will cause this to return true.
   static bool IsEnabled();
 
   explicit SiteEngagementService(Profile* profile);
   ~SiteEngagementService() override;
 
   // Update the karma score of the origin matching |url| for user navigation.
   void HandleNavigation(const GURL& url);
 
+  SiteEngagementEvictionPolicy* site_engagement_eviction_policy() {
+    return site_engagement_eviction_policy_.get();
+  }
+
   // Overridden from SiteEngagementScoreProvider:
   int GetScore(const GURL& url) override;
   int GetTotalEngagementPoints() override;
 
  private:
   Profile* profile_;
 
+  scoped_ptr<SiteEngagementEvictionPolicy> site_engagement_eviction_policy_;
+
   // The clock used to vend times.
   base::DefaultClock clock_;
 
   DISALLOW_COPY_AND_ASSIGN(SiteEngagementService);
 };
 
 #endif  // CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_SERVICE_H_