Use the site engagement eviction policy for temporary storage eviction.

chrome/browser/engagement/site_engagement_service.cc

Index: chrome/browser/engagement/site_engagement_service.cc
diff --git a/chrome/browser/engagement/site_engagement_service.cc b/chrome/browser/engagement/site_engagement_service.cc
index 5f36f19ba525753cb54e04c913119451d858a8fa..fb0218d0a0b7fba64ceecfc20a6978106294719b 100644
--- a/chrome/browser/engagement/site_engagement_service.cc
+++ b/chrome/browser/engagement/site_engagement_service.cc
@@ -10,6 +10,7 @@
 #include "base/command_line.h"
 #include "base/time/clock.h"
 #include "base/values.h"
+#include "chrome/browser/engagement/site_engagement_eviction_policy.h"
 #include "chrome/browser/engagement/site_engagement_helper.h"
 #include "chrome/browser/engagement/site_engagement_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
@@ -157,11 +158,16 @@ SiteEngagementService* SiteEngagementService::Get(Profile* profile) {
 // static
 bool SiteEngagementService::IsEnabled() {
   return base::CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableSiteEngagementService);
+             switches::kEnableSiteEngagementService) ||
+         SiteEngagementEvictionPolicy::IsEnabled();
 }
 
 SiteEngagementService::SiteEngagementService(Profile* profile)
     : profile_(profile) {
+  if (SiteEngagementEvictionPolicy::IsEnabled()) {
+    site_engagement_eviction_policy.reset(
+        new SiteEngagementEvictionPolicy(profile));
+  }
 }
 
 SiteEngagementService::~SiteEngagementService() {