Use QuicClientSocketManager to pick source port for Hyperloop client.

Notes:
1. QuicClientSocketManager is instantiated per thread.
2. Each QuicClientSocketManager claims a unique set of local ports.
3. When a source port is needed, QuicClientSocketManager will look up the ones it claimed first. Otherwise, it will get one by bind/connect on a SO_REUSEPORT socket.

Protected by FLAGS_gfe2_restart_flag_gfe_quic_use_backend_port_picker.

PiperOrigin-RevId: 978746691

quiche/quic/core/quic_udp_socket.h

diff --git a/quiche/quic/core/quic_udp_socket.h b/quiche/quic/core/quic_udp_socket.h
index 2f4e5c7..6c237c0 100644
--- a/quiche/quic/core/quic_udp_socket.h
+++ b/quiche/quic/core/quic_udp_socket.h
@@ -292,10 +292,11 @@
                           size_t packet_buffer_len,
                           const QuicUdpPacketInfo& packet_info);
 
- protected:
   bool SetupSocket(QuicUdpSocketFd fd, int address_family,
                    int receive_buffer_size, int send_buffer_size,
                    bool ipv6_only);
+
+ protected:
   bool EnableReceiveSelfIpAddressForV4(QuicUdpSocketFd fd);
   bool EnableReceiveSelfIpAddressForV6(QuicUdpSocketFd fd);
 };

quiche/quic/tools/quic_client_default_network_helper.h

diff --git a/quiche/quic/tools/quic_client_default_network_helper.h b/quiche/quic/tools/quic_client_default_network_helper.h
index ecf9ced..83cd239 100644
--- a/quiche/quic/tools/quic_client_default_network_helper.h
+++ b/quiche/quic/tools/quic_client_default_network_helper.h
@@ -139,6 +139,10 @@
   bool RegisterSocket(SocketFd fd, QuicSocketEventMask event_mask,
                       QuicSocketAddress client_address);
 
+  void set_overflow_supported(bool overflow_supported) {
+    overflow_supported_ = overflow_supported;
+  }
+
  private:
   // Listens for events on the client socket.
   QuicEventLoop* event_loop_;