Support port range for IPC P2P UDP sockets.

content/common/p2p_socket_type.h

Index: content/common/p2p_socket_type.h
diff --git a/content/common/p2p_socket_type.h b/content/common/p2p_socket_type.h
index 0de0e20acdd8c67e32bef89ce8f0544e8ce03b6a..d8d217274893120315eddb33cb771f44ea05a7c8 100644
--- a/content/common/p2p_socket_type.h
+++ b/content/common/p2p_socket_type.h
@@ -70,6 +70,18 @@ struct P2PSendPacketMetrics {
   base::TimeTicks send_time;
 };
 
+// Struct that carries a port range.
+struct P2PPortRange {
+  P2PPortRange() : P2PPortRange(0, 0) {}
+  P2PPortRange(uint16_t min_port, uint16_t max_port)
+      : min_port(min_port), max_port(max_port) {
+    DCHECK_LE(min_port, max_port);
+    DCHECK((min_port == 0 && max_port == 0) || min_port > 0);
+  }
+  uint16_t min_port;
+  uint16_t max_port;
+};
+
 }  // namespace content
 
 #endif  // CONTENT_COMMON_P2P_SOCKET_TYPE_H_