AsyncHostResolver: integrated HostCache, temporarily, until we have RR cache.

net/base/host_cache.h

 // Copyright (c) 2011 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 NET_BASE_HOST_CACHE_H_
 #define NET_BASE_HOST_CACHE_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 93 matching lines @@
   // Following are used by net_internals UI.
   size_t max_entries() const;
 
   base::TimeDelta success_entry_ttl() const;
 
   base::TimeDelta failure_entry_ttl() const;
 
   // Note that this map may contain expired entries.
   const EntryMap& entries() const;
 
+  // Creates a default cache.
+  static HostCache* CreateDefaultCache();
+
  private:
   FRIEND_TEST_ALL_PREFIXES(HostCacheTest, Compact);
   FRIEND_TEST_ALL_PREFIXES(HostCacheTest, NoCache);
 
   // Returns true if this cache entry's result is valid at time |now|.
   static bool CanUseEntry(const Entry* entry, const base::TimeTicks now);
 
   // Prunes entries from the cache to bring it below max entry bound. Entries
   // matching |pinned_entry| will NOT be pruned.
   void Compact(base::TimeTicks now, const Entry* pinned_entry);
@@ skipping 13 matching lines @@
   // Map from hostname (presumably in lowercase canonicalized format) to
   // a resolved result entry.
   EntryMap entries_;
 
   DISALLOW_COPY_AND_ASSIGN(HostCache);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_HOST_CACHE_H_