net: plumb DnsRRResolver from IOThread to HttpNetworkSession.

net/http/http_network_layer.h

Index: net/http/http_network_layer.h
diff --git a/net/http/http_network_layer.h b/net/http/http_network_layer.h
index dc98c3503bb254560c5698732d9dc3e03344cf75..7872fdd1721643243d12cc1efe0d5d55c6be6366 100644
--- a/net/http/http_network_layer.h
+++ b/net/http/http_network_layer.h
@@ -16,6 +16,7 @@
 namespace net {
 
 class ClientSocketFactory;
+class DnsRRResolver;
 class HostResolver;
 class HttpAuthHandlerFactory;
 class HttpNetworkDelegate;
@@ -31,6 +32,7 @@ class HttpNetworkLayer : public HttpTransactionFactory, public NonThreadSafe {
   // the lifetime of HttpNetworkLayer.
   HttpNetworkLayer(ClientSocketFactory* socket_factory,
                    HostResolver* host_resolver,
+                   DnsRRResolver* dnsrr_resolver,
                    ProxyService* proxy_service,
                    SSLConfigService* ssl_config_service,
                    HttpAuthHandlerFactory* http_auth_handler_factory,
@@ -41,6 +43,7 @@ class HttpNetworkLayer : public HttpTransactionFactory, public NonThreadSafe {
   HttpNetworkLayer(
       ClientSocketFactory* socket_factory,
       HostResolver* host_resolver,
+      DnsRRResolver* dnsrr_resolver,
       ProxyService* proxy_service,
       SSLConfigService* ssl_config_service,
       SpdySessionPool* spdy_session_pool,
@@ -55,6 +58,7 @@ class HttpNetworkLayer : public HttpTransactionFactory, public NonThreadSafe {
   // and allows other implementations to be substituted.
   static HttpTransactionFactory* CreateFactory(
       HostResolver* host_resolver,
+      DnsRRResolver* dnsrr_resolver,
       ProxyService* proxy_service,
       SSLConfigService* ssl_config_service,
       HttpAuthHandlerFactory* http_auth_handler_factory,
@@ -91,6 +95,7 @@ class HttpNetworkLayer : public HttpTransactionFactory, public NonThreadSafe {
   // The host resolver and proxy service that will be used when lazily
   // creating |session_|.
   HostResolver* host_resolver_;
+  DnsRRResolver* dnsrr_resolver_;
   scoped_refptr<ProxyService> proxy_service_;
 
   // The SSL config service being used for the session.