Integrate SiteEngagementEvictionPolicy with QuotaManager.

storage/browser/quota/quota_manager.cc

Index: storage/browser/quota/quota_manager.cc
diff --git a/storage/browser/quota/quota_manager.cc b/storage/browser/quota/quota_manager.cc
index 52f728086b7169b02f5b62831cf50f7108b6c619..5e562ba218bca1ee7c556c8e3b646b156a091010 100644
--- a/storage/browser/quota/quota_manager.cc
+++ b/storage/browser/quota/quota_manager.cc
@@ -813,6 +813,7 @@ QuotaManager::QuotaManager(
       special_storage_policy_(special_storage_policy),
       get_disk_space_fn_(&CallSystemGetAmountOfFreeDiskSpace),
       storage_monitor_(new StorageMonitor(this)),
+      is_getting_eviction_origin_(false),
       weak_factory_(this) {
 }
 
@@ -925,6 +926,12 @@ void QuotaManager::SetUsageCacheEnabled(QuotaClient::ID client_id,
   GetUsageTracker(type)->SetUsageCacheEnabled(client_id, origin, enabled);
 }
 
+void QuotaManager::SetQuotaEvictionPolicy(
+    StorageType type,
+    scoped_ptr<QuotaEvictionPolicy> policy) {
+  eviction_policy_map_.set(type, policy.Pass());
+}
+
 void QuotaManager::DeleteOriginData(
     const GURL& origin, StorageType type, int quota_client_mask,
     const StatusCallback& callback) {
@@ -1287,7 +1294,7 @@ void QuotaManager::NotifyStorageAccessedInternal(
     const GURL& origin, StorageType type,
     base::Time accessed_time) {
   LazyInitialize();
-  if (type == kStorageTypeTemporary && !lru_origin_callback_.is_null()) {
+  if (type == kStorageTypeTemporary && is_getting_eviction_origin_) {
     // Record the accessed origins while GetLRUOrigin task is runing
     // to filter out them from eviction.
     access_notified_origins_.insert(origin);
@@ -1442,7 +1449,29 @@ void QuotaManager::DidGetPersistentGlobalUsageForHistogram(
 
 void QuotaManager::GetEvictionOrigin(StorageType type,
                                      const GetOriginCallback& callback) {
-  GetLRUOrigin(type, callback);
+  LazyInitialize();
+  is_getting_eviction_origin_ = true;
+
+  GetOriginCallback did_get_origin_callback =
+      base::Bind(&QuotaManager::DidGetEvictionOrigin,
+                 weak_factory_.GetWeakPtr(), callback);
+
+  auto eviction_policy = eviction_policy_map_.find(type);
+  if (eviction_policy != eviction_policy_map_.end()) {
+    eviction_policy->second->GetEvictionOrigin(
+        special_storage_policy_,
+        did_get_origin_callback);
+  }
+
+  // TODO(calamity): convert LRU origin retrieval into a QuotaEvictionPolicy.
+  GetLRUOrigin(type, did_get_origin_callback);
+}
+
+void QuotaManager::DidGetEvictionOrigin(const GetOriginCallback& callback,
+                                        const GURL& origin) {
+  callback.Run(origin);
+
+  is_getting_eviction_origin_ = false;
 }
 
 void QuotaManager::EvictOriginData(const GURL& origin,
@@ -1486,6 +1515,7 @@ void QuotaManager::GetLRUOrigin(StorageType type,
     return;
   }
 
+  // TODO(calamity): make all QuotaEvictionPolicies aware of these exceptions.
   std::set<GURL>* exceptions = new std::set<GURL>;
   for (std::map<GURL, int>::const_iterator p = origins_in_use_.begin();
        p != origins_in_use_.end();