Add reprioritization to socket pools.

net/http/http_proxy_client_socket_pool.cc

Index: net/http/http_proxy_client_socket_pool.cc
diff --git a/net/http/http_proxy_client_socket_pool.cc b/net/http/http_proxy_client_socket_pool.cc
index 5d49616a436d68b0a788af1dc42a8fe88d37af04..b83e9249ecf949bebc205a41f21784e48de9be51 100644
--- a/net/http/http_proxy_client_socket_pool.cc
+++ b/net/http/http_proxy_client_socket_pool.cc
@@ -245,6 +245,12 @@ void HttpProxyClientSocketPool::CancelRequest(
   base_.CancelRequest(group_name, handle);
 }
 
+void HttpProxyClientSocketPool::SetPriority(const std::string& group_name,
+                                            ClientSocketHandle* handle,
+                                            RequestPriority priority) {
+  base_.SetPriority(group_name, handle, priority);
+}
+
 void HttpProxyClientSocketPool::ReleaseSocket(
     const std::string& group_name,
     std::unique_ptr<StreamSocket> socket,