Cronet: Use stale DNS cache entries experimentally.

net/dns/host_resolver.cc

Index: net/dns/host_resolver.cc
diff --git a/net/dns/host_resolver.cc b/net/dns/host_resolver.cc
index be393b047e433495cd453cbe02c6c7bb55bbfcb9..426ee72cce13a05f7520614be4b04298b7d4e5d2 100644
--- a/net/dns/host_resolver.cc
+++ b/net/dns/host_resolver.cc
@@ -5,6 +5,7 @@
 #include "net/dns/host_resolver.h"
 
 #include "base/logging.h"
+#include "base/memory/ptr_util.h"
 #include "base/metrics/field_trial.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
@@ -118,20 +119,32 @@ std::unique_ptr<base::Value> HostResolver::GetDnsConfigAsValue() const {
 }
 
 // static
-std::unique_ptr<HostResolver> HostResolver::CreateSystemResolver(
+std::unique_ptr<HostResolverImpl> HostResolver::CreateSystemResolverImpl(
     const Options& options,
     NetLog* net_log) {
-  return std::unique_ptr<HostResolver>(new HostResolverImpl(options, net_log));
+  return base::WrapUnique(new HostResolverImpl(options, net_log));
 }
 
 // static
-std::unique_ptr<HostResolver> HostResolver::CreateDefaultResolver(
+std::unique_ptr<HostResolverImpl> HostResolver::CreateDefaultResolverImpl(
+    NetLog* net_log) {
+  return CreateSystemResolverImpl(Options(), net_log);
+}

[Ryan Sleevi, 2016/06/21 01:25:53]

STYLE: Match declaration and definition order (e.g. between .h and .cc files)

[Julia Tuttle, 2016/07/18 18:43:32]

Done.

+
+// static
+std::unique_ptr<HostResolver> HostResolver::CreateSystemResolver(
+    const Options& options,
     NetLog* net_log) {
   return std::unique_ptr<HostResolver>(
-      new HostResolverImpl(Options(), net_log));
+      CreateSystemResolverImpl(options, net_log).release());
 }
 
-HostResolver::HostResolver() {
+// static
+std::unique_ptr<HostResolver> HostResolver::CreateDefaultResolver(
+    NetLog* net_log) {
+  return CreateSystemResolver(Options(), net_log);
 }
 
+HostResolver::HostResolver() {}
+
 }  // namespace net