[net] Add AsyncDNS.TTL histogram.

net/base/host_cache.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/base/host_cache.h"
 
 #include "base/logging.h"
 #include "net/base/net_errors.h"
 
 namespace net {
@@ skipping 19 matching lines @@
 
 const HostCache::Entry* HostCache::Lookup(const Key& key,
                                           base::TimeTicks now) {
   DCHECK(CalledOnValidThread());
   if (caching_is_disabled())
     return NULL;
 
   return entries_.Get(key, now);
 }
 
-void HostCache::Set(const Key& key,
-                    int error,
-                    const AddressList& addrlist,
-                    base::TimeTicks now,
-                    base::TimeDelta ttl) {
+HostCache::Entry* HostCache::Set(const Key& key,
+                                 int error,
+                                 const AddressList& addrlist,
+                                 base::TimeTicks now,
+                                 base::TimeDelta ttl) {
   DCHECK(CalledOnValidThread());
   if (caching_is_disabled())
-    return;
+    return NULL;
 
-  entries_.Put(key, Entry(error, addrlist), now, now + ttl);
+  return entries_.Put(key, Entry(error, addrlist), now, now + ttl);
 }
 
 void HostCache::clear() {
   DCHECK(CalledOnValidThread());
   entries_.Clear();
 }
 
 size_t HostCache::size() const {
   DCHECK(CalledOnValidThread());
   return entries_.size();
@@ skipping 17 matching lines @@
   // http://crbug.com/143454
   // TODO(szym): Determine the best size. http://crbug.com/114277
   static const size_t kMaxHostCacheEntries = 1000;
 #else
   static const size_t kMaxHostCacheEntries = 100;
 #endif
   return new HostCache(kMaxHostCacheEntries);
 }
 
 }  // namespace net