Always use recvmmsg or recvmsg if it's available, and consolidate ReadAndDispatchPackets and ReadAn…

net/tools/quic/quic_packet_reader.h

Index: net/tools/quic/quic_packet_reader.h
diff --git a/net/tools/quic/quic_packet_reader.h b/net/tools/quic/quic_packet_reader.h
index 22a6f49d4aa8c84ddbe0b2969f1706ef4bcd3206..6ffe26bc2af68bb8c8aa436a041bebe937e60705 100644
--- a/net/tools/quic/quic_packet_reader.h
+++ b/net/tools/quic/quic_packet_reader.h
@@ -48,16 +48,22 @@ class QuicPacketReader {
                                       ProcessPacketInterface* processor,
                                       QuicPacketCount* packets_dropped);
 
-  // Same as ReadAndDispatchPackets, only does one packet at a time.
+ private:
+  // Initialize the internal state of the reader.
+  void Initialize();
+
+  // Reads and dispatches many packets using recvmmsg.
+  bool ReadAndDispatchManyPackets(int fd,
+                                  int port,
+                                  ProcessPacketInterface* processor,
+                                  QuicPacketCount* packets_dropped);
+
+  // Reads and dispatches a single packet using recvmsg.
   static bool ReadAndDispatchSinglePacket(int fd,
                                           int port,
                                           ProcessPacketInterface* processor,
                                           QuicPacketCount* packets_dropped);
 
- private:
-  // Initialize the internal state of the reader.
-  void Initialize();
-
   // Storage only used when recvmmsg is available.
 
 #if MMSG_MORE