Add a new QUIC Ack Decimation mode that is reordering tolerant. Protected by FLAG_quic_ack_decimati…

net/quic/test_tools/quic_connection_peer.h

Index: net/quic/test_tools/quic_connection_peer.h
diff --git a/net/quic/test_tools/quic_connection_peer.h b/net/quic/test_tools/quic_connection_peer.h
index 524eb159ffc1dd7f9030a0e0fb1a4ccb3d151eb5..4eabb8dd86f11f87e72a857f6f5e93f32104285d 100644
--- a/net/quic/test_tools/quic_connection_peer.h
+++ b/net/quic/test_tools/quic_connection_peer.h
@@ -7,6 +7,7 @@
 
 #include "base/macros.h"
 #include "net/base/ip_endpoint.h"
+#include "net/quic/quic_connection.h"
 #include "net/quic/quic_connection_stats.h"
 #include "net/quic/quic_protocol.h"
 
@@ -15,7 +16,6 @@ namespace net {
 struct QuicAckFrame;
 struct QuicPacketHeader;
 class QuicAlarm;
-class QuicConnection;
 class QuicConnectionHelperInterface;
 class QuicConnectionVisitorInterface;
 class QuicEncryptedPacket;
@@ -122,7 +122,8 @@ class QuicConnectionPeer {
                                          QuicPacketCount packets);
   static void SetNextMtuProbeAt(QuicConnection* connection,
                                 QuicPacketNumber number);
-  static void EnableAckDecimation(QuicConnection* connection);
+  static void SetAckMode(QuicConnection* connection,
+                         QuicConnection::AckMode ack_mode);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(QuicConnectionPeer);