Leverage profile's http network session's HttpAuthCache to support proxy auth.

google_apis/gcm/engine/connection_factory_impl.h

Index: google_apis/gcm/engine/connection_factory_impl.h
diff --git a/google_apis/gcm/engine/connection_factory_impl.h b/google_apis/gcm/engine/connection_factory_impl.h
index 80fbc94ea8c073ceb6caa0408e0bbb8c84f9d6ba..be0f2bd8bd558537f87c199d47fe3cbf7d60439e 100644
--- a/google_apis/gcm/engine/connection_factory_impl.h
+++ b/google_apis/gcm/engine/connection_factory_impl.h
@@ -31,10 +31,15 @@ class GCM_EXPORT ConnectionFactoryImpl :
     public ConnectionFactory,
     public net::NetworkChangeNotifier::NetworkChangeObserver {
  public:
+  // |http_network_session| is an optional network session to use as a source
+  // for proxy auth credentials (via its HttpAuthCache). |gcm_network_session|
+  // is the network session through which GCM connections should be made, and
+  // must not be the same as |http_network_session|.
   ConnectionFactoryImpl(
       const std::vector<GURL>& mcs_endpoints,
       const net::BackoffEntry::Policy& backoff_policy,
-      scoped_refptr<net::HttpNetworkSession> network_session,
+      const scoped_refptr<net::HttpNetworkSession>& http_network_session,
+      const scoped_refptr<net::HttpNetworkSession>& gcm_network_session,
       net::NetLog* net_log,
       GCMStatsRecorder* recorder);
   virtual ~ConnectionFactoryImpl();
@@ -110,8 +115,13 @@ class GCM_EXPORT ConnectionFactoryImpl :
   int ReconsiderProxyAfterError(int error);
   void ReportSuccessfulProxyConnection();
 
+  // Closes the local socket if one is present, and resets connection handler.
   void CloseSocket();
 
+  // Updates the GCM Network Session's HttpAuthCache with the HTTP Network
+  // Session's cache, if available.
+  void RebuildNetworkSessionAuthCache();
+
   // The MCS endpoints to make connections to, sorted in order of priority.
   const std::vector<GURL> mcs_endpoints_;
   // Index to the endpoint for which a connection should be attempted next.
@@ -123,8 +133,11 @@ class GCM_EXPORT ConnectionFactoryImpl :
   const net::BackoffEntry::Policy backoff_policy_;
 
   // ---- net:: components for establishing connections. ----
-  // Network session for creating new connections.
-  const scoped_refptr<net::HttpNetworkSession> network_session_;
+  // Network session for creating new GCM connections.
+  const scoped_refptr<net::HttpNetworkSession> gcm_network_session_;
+  // HTTP Network session. If set, is used for extracting proxy auth
+  // credentials. If not set, is ignored.
+  const scoped_refptr<net::HttpNetworkSession> http_network_session_;
   // Net log to use in connection attempts.
   net::BoundNetLog bound_net_log_;
   // The current PAC request, if one exists. Owned by the proxy service.