Use the site engagement eviction policy for temporary storage eviction.

chrome/browser/engagement/site_engagement_eviction_policy.cc

Index: chrome/browser/engagement/site_engagement_eviction_policy.cc
diff --git a/chrome/browser/engagement/site_engagement_eviction_policy.cc b/chrome/browser/engagement/site_engagement_eviction_policy.cc
index ba7a885fae5d8088978d2e9a18d8627894667c41..20601b4ec224b7000a2a05e2cf0b09897fe5d64e 100644
--- a/chrome/browser/engagement/site_engagement_eviction_policy.cc
+++ b/chrome/browser/engagement/site_engagement_eviction_policy.cc
@@ -2,12 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/barrier_closure.h"
+#include "base/command_line.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/engagement/site_engagement_eviction_policy.h"
 #include "chrome/browser/engagement/site_engagement_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/common/chrome_switches.h"
 #include "content/public/browser/browser_thread.h"
 
 namespace {
@@ -87,6 +88,12 @@ GURL GetSiteEngagementEvictionOriginOnUIThread(
 
 }  // namespace
 
+// static
+bool SiteEngagementEvictionPolicy::IsEnabled() {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableSiteEngagementStorageEviction);
+}
+
 SiteEngagementEvictionPolicy::SiteEngagementEvictionPolicy(
     content::BrowserContext* browser_context)
     : browser_context_(browser_context) {}