net: plumb DnsRRResolver from IOThread to HttpNetworkSession.

net/url_request/url_request_context.h

 // Copyright (c) 2010 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.
 
 // This class represents contextual information (cookies, cache, etc.)
 // that's useful when processing resource requests.
 // The class is reference-counted so that it can be cleaned up after any
 // requests that are using it have been completed.
 
 #ifndef NET_URL_REQUEST_URL_REQUEST_CONTEXT_H_
 #define NET_URL_REQUEST_URL_REQUEST_CONTEXT_H_
 #pragma once
 
 #include "base/non_thread_safe.h"
 #include "base/ref_counted.h"
 #include "net/base/net_log.h"
 #include "net/base/ssl_config_service.h"
 #include "net/base/transport_security_state.h"
 #include "net/ftp/ftp_auth_cache.h"
 #include "net/proxy/proxy_service.h"
 
 namespace net {
 class CookiePolicy;
 class CookieStore;
+class DnsRRResolver;
 class FtpTransactionFactory;
 class HostResolver;
 class HttpAuthHandlerFactory;
 class HttpNetworkDelegate;
 class HttpTransactionFactory;
 class SSLConfigService;
 }
 class URLRequest;
 
 // Subclass to provide application-specific context for URLRequest instances.
 class URLRequestContext
     : public base::RefCountedThreadSafe<URLRequestContext>,
       public NonThreadSafe {
  public:
   URLRequestContext();
 
   net::NetLog* net_log() const {
     return net_log_;
   }
 
   net::HostResolver* host_resolver() const {
     return host_resolver_;
   }
 
+  net::DnsRRResolver* dnsrr_resolver() const {
+    return dnsrr_resolver_;
+  }
+
   // Get the proxy service for this context.
   net::ProxyService* proxy_service() const {
     return proxy_service_;
   }
 
   // Get the ssl config service for this context.
   net::SSLConfigService* ssl_config_service() const {
     return ssl_config_service_;
   }
 
@@ skipping 47 matching lines @@
 
  protected:
   friend class base::RefCountedThreadSafe<URLRequestContext>;
 
   virtual ~URLRequestContext();
 
   // The following members are expected to be initialized and owned by
   // subclasses.
   net::NetLog* net_log_;
   net::HostResolver* host_resolver_;
+  net::DnsRRResolver* dnsrr_resolver_;
   scoped_refptr<net::ProxyService> proxy_service_;
   scoped_refptr<net::SSLConfigService> ssl_config_service_;
   net::HttpTransactionFactory* http_transaction_factory_;
   net::FtpTransactionFactory* ftp_transaction_factory_;
   net::HttpAuthHandlerFactory* http_auth_handler_factory_;
   net::HttpNetworkDelegate* network_delegate_;
   scoped_refptr<net::CookieStore> cookie_store_;
   net::CookiePolicy* cookie_policy_;
   scoped_refptr<net::TransportSecurityState> transport_security_state_;
   net::FtpAuthCache ftp_auth_cache_;
   std::string accept_language_;
   std::string accept_charset_;
   // The charset of the referrer where this request comes from. It's not
   // used in communication with a server but is used to construct a suggested
   // filename for file download.
   std::string referrer_charset_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(URLRequestContext);
 };
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_CONTEXT_H_