Convert ignore_limits from a SocketParam to a socket request argument.

net/socket/client_socket_pool.h

Index: net/socket/client_socket_pool.h
diff --git a/net/socket/client_socket_pool.h b/net/socket/client_socket_pool.h
index e1785a3a7c7bf3c9aee0f9e27b21fd57d03e1c18..e26f6a9deb24b0e88e1ef2317e3081632fa6e67d 100644
--- a/net/socket/client_socket_pool.h
+++ b/net/socket/client_socket_pool.h
@@ -96,9 +96,13 @@ class NET_EXPORT ClientSocketPool : public LowerLayeredPool {
   // client of completion.
   //
   // Profiling information for the request is saved to |net_log| if non-NULL.
+  //
+  // If |ignore_limits| is true, priority must be HIGHEST, and the request will
+  // ignore normal socket pool group limits.
   virtual int RequestSocket(const std::string& group_name,
                             const void* params,
                             RequestPriority priority,
+                            bool ignore_limits,
                             ClientSocketHandle* handle,
                             const CompletionCallback& callback,
                             const BoundNetLog& net_log) = 0;