Add HostCachePersistenceManager for Cronet

net/dns/host_cache_unittest.cc

 // Copyright (c) 2012 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.
 
 #include "net/dns/host_cache.h"
 
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 686 matching lines @@
   EXPECT_EQ(2u, cache.size());
 
   EXPECT_FALSE(cache.Lookup(key3, now));
   cache.Set(key3, entry3, now, kTTL);
   EXPECT_TRUE(cache.Lookup(key3, now));
   EXPECT_EQ(3u, cache.size());
 
   // Advance to t=12, ansd serialize the cache.
   now += base::TimeDelta::FromSeconds(7);
 
-  std::unique_ptr<base::ListValue> serialized_cache =
-      cache.GetAsListValue(/*include_staleness=*/false);
+  base::ListValue serialized_cache;
+  cache.GetAsListValue(&serialized_cache, /*include_staleness=*/false);
   HostCache restored_cache(kMaxCacheEntries);
 
   // Add entries for "foobar3.com" and "foobar4.com" to the cache before
   // restoring it. The "foobar3.com" result is different from the original.
   EXPECT_FALSE(restored_cache.Lookup(key3, now));
   restored_cache.Set(key3, entry1, now, kTTL);
   EXPECT_TRUE(restored_cache.Lookup(key3, now));
   EXPECT_EQ(1u, restored_cache.size());
 
   EXPECT_FALSE(restored_cache.Lookup(key4, now));
   restored_cache.Set(key4, entry4, now, kTTL);
   EXPECT_TRUE(restored_cache.Lookup(key4, now));
   EXPECT_EQ(2u, restored_cache.size());
 
-  restored_cache.RestoreFromListValue(*serialized_cache);
+  restored_cache.RestoreFromListValue(serialized_cache);
 
   HostCache::EntryStaleness stale;
 
   // The "foobar.com" entry is stale due to both network changes and expiration
   // time.
   EXPECT_FALSE(restored_cache.Lookup(key1, now));
   const HostCache::Entry* result1 =
       restored_cache.LookupStale(key1, now, &stale);
   EXPECT_TRUE(result1);
   EXPECT_EQ(1u, result1->addresses().size());
@@ skipping 96 matching lines @@
 
   // Add an entry for "foobar2.com" with different error.
   EXPECT_TRUE(cache.Lookup(key1, now));
   cache.Set(key2, entry4, now, kTTL);
   EXPECT_TRUE(cache.Lookup(key1, now));
   EXPECT_EQ(2u, cache.size());
   EXPECT_EQ(4, delegate.num_changes());
 }
 
 }  // namespace net