Attempting to re-land CL 3110006 which turned out to have ...

net/http/http_network_session.cc

Index: net/http/http_network_session.cc
===================================================================
--- net/http/http_network_session.cc	(revision 57349)
+++ net/http/http_network_session.cc	(working copy)
@@ -46,6 +46,10 @@
       tcp_for_http_proxy_pool_histograms_(
           new ClientSocketPoolHistograms("TCPforHTTPProxy")),
       http_proxy_pool_histograms_(new ClientSocketPoolHistograms("HTTPProxy")),
+      tcp_for_https_proxy_pool_histograms_(
+          new ClientSocketPoolHistograms("TCPforHTTPSProxy")),
+      ssl_for_https_proxy_pool_histograms_(
+          new ClientSocketPoolHistograms("SSLforHTTPSProxy")),
       tcp_for_socks_pool_histograms_(
           new ClientSocketPoolHistograms("TCPforSOCKS")),
       socks_pool_histograms_(new ClientSocketPoolHistograms("SOCK")),
@@ -91,6 +95,16 @@
                       g_max_sockets_per_proxy_server, g_max_sockets_per_group,
                       tcp_for_http_proxy_pool_histograms_, host_resolver_,
                       socket_factory_, net_log_),
+                  new SSLClientSocketPool(
+                      g_max_sockets_per_proxy_server, g_max_sockets_per_group,
+                      ssl_for_https_proxy_pool_histograms_, host_resolver_,
+                      socket_factory_,
+                      new TCPClientSocketPool(
+                          g_max_sockets_per_proxy_server,
+                          g_max_sockets_per_group,
+                          tcp_for_https_proxy_pool_histograms_, host_resolver_,
+                          socket_factory_, net_log_),
+                          NULL, NULL, net_log_),
                   net_log_)));
 
   return ret.first->second;