Add QuicSentPacketManagerInterface, and QuicSentPacketManager implements it. No functional change e…

net/quic/test_tools/quic_sent_packet_manager_peer.h

Index: net/quic/test_tools/quic_sent_packet_manager_peer.h
diff --git a/net/quic/test_tools/quic_sent_packet_manager_peer.h b/net/quic/test_tools/quic_sent_packet_manager_peer.h
index 392e986f13a34201dd0b19b97909cb9101cbeba8..a583dbf85edaf0adadd49ba8457749223675627e 100644
--- a/net/quic/test_tools/quic_sent_packet_manager_peer.h
+++ b/net/quic/test_tools/quic_sent_packet_manager_peer.h
@@ -56,11 +56,14 @@ class QuicSentPacketManagerPeer {
   static QuicTime GetSentTime(const QuicSentPacketManager* sent_packet_manager,
                               QuicPacketNumber packet_number);
 
-  // Returns true if |packet_number| is a retransmission of a packet.
+  // Returns true if |packet_number| of |path_id| is a retransmission of a
+  // packet.
   static bool IsRetransmission(QuicSentPacketManager* sent_packet_manager,
+                               QuicPathId path_id,
                                QuicPacketNumber packet_number);
 
   static void MarkForRetransmission(QuicSentPacketManager* sent_packet_manager,
+                                    QuicPathId path_id,
                                     QuicPacketNumber packet_number,
                                     TransmissionType transmission_type);
 
@@ -76,8 +79,8 @@ class QuicSentPacketManagerPeer {
   static QuicByteCount GetBytesInFlight(
       const QuicSentPacketManager* sent_packet_manager);
 
-  static QuicSentPacketManager::NetworkChangeVisitor* GetNetworkChangeVisitor(
-      const QuicSentPacketManager* sent_packet_manager);
+  static QuicSentPacketManagerInterface::NetworkChangeVisitor*
+  GetNetworkChangeVisitor(const QuicSentPacketManager* sent_packet_manager);
 
   static void SetConsecutiveRtoCount(QuicSentPacketManager* sent_packet_manager,
                                      size_t count);
@@ -88,6 +91,8 @@ class QuicSentPacketManagerPeer {
   static QuicSustainedBandwidthRecorder& GetBandwidthRecorder(
       QuicSentPacketManager* sent_packet_manager);
 
+  static bool UsingPacing(const QuicSentPacketManager* sent_packet_manager);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(QuicSentPacketManagerPeer);
 };