Landing Recent QUIC changes until Fri Nov 18 23:21:04 2016 +0000

net/quic/core/quic_protocol.h

Index: net/quic/core/quic_protocol.h
diff --git a/net/quic/core/quic_protocol.h b/net/quic/core/quic_protocol.h
deleted file mode 100644
index adb9d8f840b1d4e3b8b3cc1b30daf4f032eb523c..0000000000000000000000000000000000000000
--- a/net/quic/core/quic_protocol.h
+++ /dev/null
@@ -1,766 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef NET_QUIC_QUIC_PROTOCOL_H_
-#define NET_QUIC_QUIC_PROTOCOL_H_
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include <array>
-#include <limits>
-#include <list>
-#include <map>
-#include <memory>
-#include <ostream>
-#include <set>
-#include <string>
-#include <utility>
-#include <vector>
-
-#include "base/logging.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/strings/string_piece.h"
-#include "net/base/int128.h"
-#include "net/base/iovec.h"
-#include "net/base/net_export.h"
-#include "net/quic/core/interval_set.h"
-#include "net/quic/core/quic_bandwidth.h"
-#include "net/quic/core/quic_buffer_allocator.h"
-#include "net/quic/core/quic_constants.h"
-#include "net/quic/core/quic_error_codes.h"
-#include "net/quic/core/quic_time.h"
-#include "net/quic/core/quic_types.h"
-#include "net/quic/core/quic_versions.h"
-#include "net/quic/platform/api/quic_socket_address.h"
-
-namespace net {
-
-class QuicPacket;
-struct QuicPacketHeader;
-
-// Size in bytes of the data packet header.
-NET_EXPORT_PRIVATE size_t GetPacketHeaderSize(QuicVersion version,
-                                              const QuicPacketHeader& header);
-
-NET_EXPORT_PRIVATE size_t
-GetPacketHeaderSize(QuicVersion version,
-                    QuicConnectionIdLength connection_id_length,
-                    bool include_version,
-                    bool include_path_id,
-                    bool include_diversification_nonce,
-                    QuicPacketNumberLength packet_number_length);
-
-// Index of the first byte in a QUIC packet of encrypted data.
-NET_EXPORT_PRIVATE size_t
-GetStartOfEncryptedData(QuicVersion version, const QuicPacketHeader& header);
-
-NET_EXPORT_PRIVATE size_t
-GetStartOfEncryptedData(QuicVersion version,
-                        QuicConnectionIdLength connection_id_length,
-                        bool include_version,
-                        bool include_path_id,
-                        bool include_diversification_nonce,
-                        QuicPacketNumberLength packet_number_length);
-
-struct NET_EXPORT_PRIVATE QuicPacketPublicHeader {
-  QuicPacketPublicHeader();
-  explicit QuicPacketPublicHeader(const QuicPacketPublicHeader& other);
-  ~QuicPacketPublicHeader();
-
-  // Universal header. All QuicPacket headers will have a connection_id and
-  // public flags.
-  QuicConnectionId connection_id;
-  QuicConnectionIdLength connection_id_length;
-  bool multipath_flag;
-  bool reset_flag;
-  bool version_flag;
-  QuicPacketNumberLength packet_number_length;
-  QuicVersionVector versions;
-  // nonce contains an optional, 32-byte nonce value. If not included in the
-  // packet, |nonce| will be empty.
-  DiversificationNonce* nonce;
-};
-
-// Header for Data packets.
-struct NET_EXPORT_PRIVATE QuicPacketHeader {
-  QuicPacketHeader();
-  explicit QuicPacketHeader(const QuicPacketPublicHeader& header);
-  QuicPacketHeader(const QuicPacketHeader& other);
-
-  NET_EXPORT_PRIVATE friend std::ostream& operator<<(std::ostream& os,
-                                                     const QuicPacketHeader& s);
-
-  QuicPacketPublicHeader public_header;
-  QuicPacketNumber packet_number;
-  QuicPathId path_id;
-};
-
-struct NET_EXPORT_PRIVATE QuicPublicResetPacket {
-  QuicPublicResetPacket();
-  explicit QuicPublicResetPacket(const QuicPacketPublicHeader& header);
-
-  QuicPacketPublicHeader public_header;
-  QuicPublicResetNonceProof nonce_proof;
-  // TODO(fayang): remove rejected_packet_number when deprecating
-  // FLAGS_quic_remove_packet_number_from_public_reset.
-  QuicPacketNumber rejected_packet_number;
-  QuicSocketAddress client_address;
-};
-
-typedef QuicPacketPublicHeader QuicVersionNegotiationPacket;
-
-// A padding frame contains no payload.
-struct NET_EXPORT_PRIVATE QuicPaddingFrame {
-  QuicPaddingFrame() : num_padding_bytes(-1) {}
-  explicit QuicPaddingFrame(int num_padding_bytes)
-      : num_padding_bytes(num_padding_bytes) {}
-
-  NET_EXPORT_PRIVATE friend std::ostream& operator<<(std::ostream& os,
-                                                     const QuicPaddingFrame& s);
-
-  // -1: full padding to the end of a max-sized packet
-  // otherwise: only pad up to num_padding_bytes bytes
-  int num_padding_bytes;
-};
-
-// A ping frame contains no payload, though it is retransmittable,
-// and ACK'd just like other normal frames.
-struct NET_EXPORT_PRIVATE QuicPingFrame {};
-
-// A path MTU discovery frame contains no payload and is serialized as a ping
-// frame.
-struct NET_EXPORT_PRIVATE QuicMtuDiscoveryFrame {};
-
-// Deleter for stream buffers. Copyable to support platforms where the deleter
-// of a unique_ptr must be copyable. Otherwise it would be nice for this to be
-// move-only.
-class NET_EXPORT_PRIVATE StreamBufferDeleter {
- public:
-  StreamBufferDeleter() : allocator_(nullptr) {}
-  explicit StreamBufferDeleter(QuicBufferAllocator* allocator)
-      : allocator_(allocator) {}
-
-  // Deletes |buffer| using |allocator_|.
-  void operator()(char* buffer) const;
-
- private:
-  // Not owned; must be valid so long as the buffer stored in the unique_ptr
-  // that owns |this| is valid.
-  QuicBufferAllocator* allocator_;
-};
-
-using UniqueStreamBuffer = std::unique_ptr<char[], StreamBufferDeleter>;
-
-// Allocates memory of size |size| using |allocator| for a QUIC stream buffer.
-NET_EXPORT_PRIVATE UniqueStreamBuffer
-NewStreamBuffer(QuicBufferAllocator* allocator, size_t size);
-
-struct NET_EXPORT_PRIVATE QuicStreamFrame {
-  QuicStreamFrame();
-  QuicStreamFrame(QuicStreamId stream_id,
-                  bool fin,
-                  QuicStreamOffset offset,
-                  base::StringPiece data);
-  QuicStreamFrame(QuicStreamId stream_id,
-                  bool fin,
-                  QuicStreamOffset offset,
-                  QuicPacketLength data_length,
-                  UniqueStreamBuffer buffer);
-  ~QuicStreamFrame();
-
-  NET_EXPORT_PRIVATE friend std::ostream& operator<<(std::ostream& os,
-                                                     const QuicStreamFrame& s);
-
-  QuicStreamId stream_id;
-  bool fin;
-  QuicPacketLength data_length;
-  const char* data_buffer;
-  QuicStreamOffset offset;  // Location of this data in the stream.
-  // nullptr when the QuicStreamFrame is received, and non-null when sent.
-  UniqueStreamBuffer buffer;
-
- private:
-  QuicStreamFrame(QuicStreamId stream_id,
-                  bool fin,
-                  QuicStreamOffset offset,
-                  const char* data_buffer,
-                  QuicPacketLength data_length,
-                  UniqueStreamBuffer buffer);
-
-  DISALLOW_COPY_AND_ASSIGN(QuicStreamFrame);
-};
-static_assert(sizeof(QuicStreamFrame) <= 64,
-              "Keep the QuicStreamFrame size to a cacheline.");
-
-typedef std::vector<std::pair<QuicPacketNumber, QuicTime>> PacketTimeVector;
-
-struct NET_EXPORT_PRIVATE QuicStopWaitingFrame {
-  QuicStopWaitingFrame();
-  ~QuicStopWaitingFrame();
-
-  NET_EXPORT_PRIVATE friend std::ostream& operator<<(
-      std::ostream& os,
-      const QuicStopWaitingFrame& s);
-  // Path which this stop waiting frame belongs to.
-  QuicPathId path_id;
-  // The lowest packet we've sent which is unacked, and we expect an ack for.
-  QuicPacketNumber least_unacked;
-};
-
-// A sequence of packet numbers where each number is unique. Intended to be used
-// in a sliding window fashion, where smaller old packet numbers are removed and
-// larger new packet numbers are added, with the occasional random access.
-class NET_EXPORT_PRIVATE PacketNumberQueue {
- public:
-  using const_iterator = IntervalSet<QuicPacketNumber>::const_iterator;
-  using const_reverse_iterator =
-      IntervalSet<QuicPacketNumber>::const_reverse_iterator;
-
-  PacketNumberQueue();
-  PacketNumberQueue(const PacketNumberQueue& other);
-  // TODO(rtenneti): on windows RValue reference gives errors.
-  // PacketNumberQueue(PacketNumberQueue&& other);
-  ~PacketNumberQueue();
-
-  PacketNumberQueue& operator=(const PacketNumberQueue& other);
-  // PacketNumberQueue& operator=(PacketNumberQueue&& other);
-
-  // Adds |packet_number| to the set of packets in the queue.
-  void Add(QuicPacketNumber packet_number);
-
-  // Adds packets between [lower, higher) to the set of packets in the queue. It
-  // is undefined behavior to call this with |higher| < |lower|.
-  void Add(QuicPacketNumber lower, QuicPacketNumber higher);
-
-  // Removes |packet_number| from the set of packets in the queue.
-  void Remove(QuicPacketNumber packet_number);
-
-  // Removes packets numbers between [lower, higher) to the set of packets in
-  // the queue. It is undefined behavior to call this with |higher| < |lower|.
-  void Remove(QuicPacketNumber lower, QuicPacketNumber higher);
-
-  // Removes packets with values less than |higher| from the set of packets in
-  // the queue. Returns true if packets were removed.
-  bool RemoveUpTo(QuicPacketNumber higher);
-
-  // Mutates packet number set so that it contains only those packet numbers
-  // from minimum to maximum packet number not currently in the set. Do nothing
-  // if packet number set is empty.
-  void Complement();
-
-  // Returns true if the queue contains |packet_number|.
-  bool Contains(QuicPacketNumber packet_number) const;
-
-  // Returns true if the queue is empty.
-  bool Empty() const;
-
-  // Returns the minimum packet number stored in the queue. It is undefined
-  // behavior to call this if the queue is empty.
-  QuicPacketNumber Min() const;
-
-  // Returns the maximum packet number stored in the queue. It is undefined
-  // behavior to call this if the queue is empty.
-  QuicPacketNumber Max() const;
-
-  // Returns the number of unique packets stored in the queue. Inefficient; only
-  // exposed for testing.
-  size_t NumPacketsSlow() const;
-
-  // Returns the number of disjoint packet number intervals contained in the
-  // queue.
-  size_t NumIntervals() const;
-
-  // Returns the length of last interval.
-  QuicPacketNumber LastIntervalLength() const;
-
-  // Returns iterators over the packet number intervals.
-  const_iterator begin() const;
-  const_iterator end() const;
-  const_reverse_iterator rbegin() const;
-  const_reverse_iterator rend() const;
-  const_iterator lower_bound(QuicPacketNumber packet_number) const;
-
-  NET_EXPORT_PRIVATE friend std::ostream& operator<<(
-      std::ostream& os,
-      const PacketNumberQueue& q);
-
- private:
-  IntervalSet<QuicPacketNumber> packet_number_intervals_;
-};
-
-struct NET_EXPORT_PRIVATE QuicAckFrame {
-  QuicAckFrame();
-  QuicAckFrame(const QuicAckFrame& other);
-  ~QuicAckFrame();
-
-  NET_EXPORT_PRIVATE friend std::ostream& operator<<(std::ostream& os,
-                                                     const QuicAckFrame& s);
-
-  // The highest packet number we've observed from the peer.
-  QuicPacketNumber largest_observed;
-
-  // Time elapsed since largest_observed was received until this Ack frame was
-  // sent.
-  QuicTime::Delta ack_delay_time;
-
-  // Vector of <packet_number, time> for when packets arrived.
-  PacketTimeVector received_packet_times;
-
-  // Set of packets.
-  PacketNumberQueue packets;
-
-  // Path which this ack belongs to.
-  QuicPathId path_id;
-};
-
-// True if the packet number is greater than largest_observed or is listed
-// as missing.
-// Always returns false for packet numbers less than least_unacked.
-bool NET_EXPORT_PRIVATE
-IsAwaitingPacket(const QuicAckFrame& ack_frame,
-                 QuicPacketNumber packet_number,
-                 QuicPacketNumber peer_least_packet_awaiting_ack);
-
-struct NET_EXPORT_PRIVATE QuicRstStreamFrame {
-  QuicRstStreamFrame();
-  QuicRstStreamFrame(QuicStreamId stream_id,
-                     QuicRstStreamErrorCode error_code,
-                     QuicStreamOffset bytes_written);
-
-  NET_EXPORT_PRIVATE friend std::ostream& operator<<(
-      std::ostream& os,
-      const QuicRstStreamFrame& r);
-
-  QuicStreamId stream_id;
-  QuicRstStreamErrorCode error_code;
-
-  // Used to update flow control windows. On termination of a stream, both
-  // endpoints must inform the peer of the number of bytes they have sent on
-  // that stream. This can be done through normal termination (data packet with
-  // FIN) or through a RST.
-  QuicStreamOffset byte_offset;
-};
-
-struct NET_EXPORT_PRIVATE QuicConnectionCloseFrame {
-  QuicConnectionCloseFrame();
-
-  NET_EXPORT_PRIVATE friend std::ostream& operator<<(
-      std::ostream& os,
-      const QuicConnectionCloseFrame& c);
-
-  QuicErrorCode error_code;
-  std::string error_details;
-};
-
-struct NET_EXPORT_PRIVATE QuicGoAwayFrame {
-  QuicGoAwayFrame();
-  QuicGoAwayFrame(QuicErrorCode error_code,
-                  QuicStreamId last_good_stream_id,
-                  const std::string& reason);
-
-  NET_EXPORT_PRIVATE friend std::ostream& operator<<(std::ostream& os,
-                                                     const QuicGoAwayFrame& g);
-
-  QuicErrorCode error_code;
-  QuicStreamId last_good_stream_id;
-  std::string reason_phrase;
-};
-
-// Flow control updates per-stream and at the connection levoel.
-// Based on SPDY's WINDOW_UPDATE frame, but uses an absolute byte offset rather
-// than a window delta.
-// TODO(rjshade): A possible future optimization is to make stream_id and
-//                byte_offset variable length, similar to stream frames.
-struct NET_EXPORT_PRIVATE QuicWindowUpdateFrame {
-  QuicWindowUpdateFrame() {}
-  QuicWindowUpdateFrame(QuicStreamId stream_id, QuicStreamOffset byte_offset);
-
-  NET_EXPORT_PRIVATE friend std::ostream& operator<<(
-      std::ostream& os,
-      const QuicWindowUpdateFrame& w);
-
-  // The stream this frame applies to.  0 is a special case meaning the overall
-  // connection rather than a specific stream.
-  QuicStreamId stream_id;
-
-  // Byte offset in the stream or connection. The receiver of this frame must
-  // not send data which would result in this offset being exceeded.
-  QuicStreamOffset byte_offset;
-};
-
-// The BLOCKED frame is used to indicate to the remote endpoint that this
-// endpoint believes itself to be flow-control blocked but otherwise ready to
-// send data. The BLOCKED frame is purely advisory and optional.
-// Based on SPDY's BLOCKED frame (undocumented as of 2014-01-28).
-struct NET_EXPORT_PRIVATE QuicBlockedFrame {
-  QuicBlockedFrame() {}
-  explicit QuicBlockedFrame(QuicStreamId stream_id);
-
-  NET_EXPORT_PRIVATE friend std::ostream& operator<<(std::ostream& os,
-                                                     const QuicBlockedFrame& b);
-
-  // The stream this frame applies to.  0 is a special case meaning the overall
-  // connection rather than a specific stream.
-  QuicStreamId stream_id;
-};
-
-// The PATH_CLOSE frame is used to explicitly close a path. Both endpoints can
-// send a PATH_CLOSE frame to initiate a path termination. A path is considered
-// to be closed either a PATH_CLOSE frame is sent or received. An endpoint drops
-// receive side of a closed path, and packets with retransmittable frames on a
-// closed path are marked as retransmissions which will be transmitted on other
-// paths.
-struct NET_EXPORT_PRIVATE QuicPathCloseFrame {
-  QuicPathCloseFrame() {}
-  explicit QuicPathCloseFrame(QuicPathId path_id);
-
-  NET_EXPORT_PRIVATE friend std::ostream& operator<<(
-      std::ostream& os,
-      const QuicPathCloseFrame& p);
-
-  QuicPathId path_id;
-};
-
-struct NET_EXPORT_PRIVATE QuicFrame {
-  QuicFrame();
-  explicit QuicFrame(QuicPaddingFrame padding_frame);
-  explicit QuicFrame(QuicMtuDiscoveryFrame frame);
-  explicit QuicFrame(QuicPingFrame frame);
-
-  explicit QuicFrame(QuicStreamFrame* stream_frame);
-  explicit QuicFrame(QuicAckFrame* frame);
-  explicit QuicFrame(QuicRstStreamFrame* frame);
-  explicit QuicFrame(QuicConnectionCloseFrame* frame);
-  explicit QuicFrame(QuicStopWaitingFrame* frame);
-  explicit QuicFrame(QuicGoAwayFrame* frame);
-  explicit QuicFrame(QuicWindowUpdateFrame* frame);
-  explicit QuicFrame(QuicBlockedFrame* frame);
-  explicit QuicFrame(QuicPathCloseFrame* frame);
-
-  NET_EXPORT_PRIVATE friend std::ostream& operator<<(std::ostream& os,
-                                                     const QuicFrame& frame);
-
-  QuicFrameType type;
-  union {
-    // Frames smaller than a pointer are inline.
-    QuicPaddingFrame padding_frame;
-    QuicMtuDiscoveryFrame mtu_discovery_frame;
-    QuicPingFrame ping_frame;
-
-    // Frames larger than a pointer.
-    QuicStreamFrame* stream_frame;
-    QuicAckFrame* ack_frame;
-    QuicStopWaitingFrame* stop_waiting_frame;
-    QuicRstStreamFrame* rst_stream_frame;
-    QuicConnectionCloseFrame* connection_close_frame;
-    QuicGoAwayFrame* goaway_frame;
-    QuicWindowUpdateFrame* window_update_frame;
-    QuicBlockedFrame* blocked_frame;
-    QuicPathCloseFrame* path_close_frame;
-  };
-};
-// QuicFrameType consumes 8 bytes with padding.
-static_assert(sizeof(QuicFrame) <= 16,
-              "Frames larger than 8 bytes should be referenced by pointer.");
-
-typedef std::vector<QuicFrame> QuicFrames;
-
-// Deletes all the sub-frames contained in |frames|.
-NET_EXPORT_PRIVATE void DeleteFrames(QuicFrames* frames);
-
-// Deletes all the QuicStreamFrames for the specified |stream_id|.
-NET_EXPORT_PRIVATE void RemoveFramesForStream(QuicFrames* frames,
-                                              QuicStreamId stream_id);
-
-class NET_EXPORT_PRIVATE QuicData {
- public:
-  QuicData(const char* buffer, size_t length);
-  QuicData(const char* buffer, size_t length, bool owns_buffer);
-  virtual ~QuicData();
-
-  base::StringPiece AsStringPiece() const {
-    return base::StringPiece(data(), length());
-  }
-
-  const char* data() const { return buffer_; }
-  size_t length() const { return length_; }
-  bool owns_buffer() const { return owns_buffer_; }
-
- private:
-  const char* buffer_;
-  size_t length_;
-  bool owns_buffer_;
-
-  DISALLOW_COPY_AND_ASSIGN(QuicData);
-};
-
-class NET_EXPORT_PRIVATE QuicPacket : public QuicData {
- public:
-  // TODO(fayang): 4 fields from public header are passed in as arguments.
-  // Consider to add a convenience method which directly accepts the entire
-  // public header.
-  QuicPacket(char* buffer,
-             size_t length,
-             bool owns_buffer,
-             QuicConnectionIdLength connection_id_length,
-             bool includes_version,
-             bool includes_path_id,
-             bool includes_diversification_nonce,
-             QuicPacketNumberLength packet_number_length);
-
-  base::StringPiece AssociatedData(QuicVersion version) const;
-  base::StringPiece Plaintext(QuicVersion version) const;
-
-  char* mutable_data() { return buffer_; }
-
- private:
-  char* buffer_;
-  const QuicConnectionIdLength connection_id_length_;
-  const bool includes_version_;
-  const bool includes_path_id_;
-  const bool includes_diversification_nonce_;
-  const QuicPacketNumberLength packet_number_length_;
-
-  DISALLOW_COPY_AND_ASSIGN(QuicPacket);
-};
-
-class NET_EXPORT_PRIVATE QuicEncryptedPacket : public QuicData {
- public:
-  QuicEncryptedPacket(const char* buffer, size_t length);
-  QuicEncryptedPacket(const char* buffer, size_t length, bool owns_buffer);
-
-  // Clones the packet into a new packet which owns the buffer.
-  std::unique_ptr<QuicEncryptedPacket> Clone() const;
-
-  // By default, gtest prints the raw bytes of an object. The bool data
-  // member (in the base class QuicData) causes this object to have padding
-  // bytes, which causes the default gtest object printer to read
-  // uninitialize memory. So we need to teach gtest how to print this object.
-  NET_EXPORT_PRIVATE friend std::ostream& operator<<(
-      std::ostream& os,
-      const QuicEncryptedPacket& s);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(QuicEncryptedPacket);
-};
-
-// A received encrypted QUIC packet, with a recorded time of receipt.
-class NET_EXPORT_PRIVATE QuicReceivedPacket : public QuicEncryptedPacket {
- public:
-  QuicReceivedPacket(const char* buffer, size_t length, QuicTime receipt_time);
-  QuicReceivedPacket(const char* buffer,
-                     size_t length,
-                     QuicTime receipt_time,
-                     bool owns_buffer);
-  QuicReceivedPacket(const char* buffer,
-                     size_t length,
-                     QuicTime receipt_time,
-                     bool owns_buffer,
-                     int ttl,
-                     bool ttl_valid);
-
-  // Clones the packet into a new packet which owns the buffer.
-  std::unique_ptr<QuicReceivedPacket> Clone() const;
-
-  // Returns the time at which the packet was received.
-  QuicTime receipt_time() const { return receipt_time_; }
-
-  // This is the TTL of the packet, assuming ttl_vaild_ is true.
-  int ttl() const { return ttl_; }
-
-  // By default, gtest prints the raw bytes of an object. The bool data
-  // member (in the base class QuicData) causes this object to have padding
-  // bytes, which causes the default gtest object printer to read
-  // uninitialize memory. So we need to teach gtest how to print this object.
-  NET_EXPORT_PRIVATE friend std::ostream& operator<<(
-      std::ostream& os,
-      const QuicReceivedPacket& s);
-
- private:
-  const QuicTime receipt_time_;
-  int ttl_;
-
-  DISALLOW_COPY_AND_ASSIGN(QuicReceivedPacket);
-};
-
-// Pure virtual class to listen for packet acknowledgements.
-class NET_EXPORT_PRIVATE QuicAckListenerInterface
-    : public base::RefCounted<QuicAckListenerInterface> {
- public:
-  QuicAckListenerInterface() {}
-
-  // Called when a packet is acked.  Called once per packet.
-  // |acked_bytes| is the number of data bytes acked.
-  virtual void OnPacketAcked(int acked_bytes,
-                             QuicTime::Delta ack_delay_time) = 0;
-
-  // Called when a packet is retransmitted.  Called once per packet.
-  // |retransmitted_bytes| is the number of data bytes retransmitted.
-  virtual void OnPacketRetransmitted(int retransmitted_bytes) = 0;
-
- protected:
-  friend class base::RefCounted<QuicAckListenerInterface>;
-
-  // Delegates are ref counted.
-  virtual ~QuicAckListenerInterface() {}
-};
-
-// Used to generate filtered supported versions based on flags.
-class NET_EXPORT_PRIVATE QuicVersionManager {
- public:
-  explicit QuicVersionManager(QuicVersionVector supported_versions);
-  virtual ~QuicVersionManager();
-
-  // Returns currently supported QUIC versions.
-  const QuicVersionVector& GetSupportedVersions();
-
- protected:
-  // Maybe refilter filtered_supported_versions_ based on flags.
-  void MaybeRefilterSupportedVersions();
-
-  // Refilters filtered_supported_versions_.
-  virtual void RefilterSupportedVersions();
-
-  const QuicVersionVector& filtered_supported_versions() const {
-    return filtered_supported_versions_;
-  }
-
- private:
-  // FLAGS_quic_enable_version_36_v3
-  bool enable_version_36_;
-  // The list of versions that may be supported.
-  QuicVersionVector allowed_supported_versions_;
-  // This vector contains QUIC versions which are currently supported based
-  // on flags.
-  QuicVersionVector filtered_supported_versions_;
-};
-
-struct NET_EXPORT_PRIVATE AckListenerWrapper {
-  AckListenerWrapper(QuicAckListenerInterface* listener,
-                     QuicPacketLength data_length);
-  AckListenerWrapper(const AckListenerWrapper& other);
-  ~AckListenerWrapper();
-
-  scoped_refptr<QuicAckListenerInterface> ack_listener;
-  QuicPacketLength length;
-};
-
-struct NET_EXPORT_PRIVATE SerializedPacket {
-  SerializedPacket(QuicPathId path_id,
-                   QuicPacketNumber packet_number,
-                   QuicPacketNumberLength packet_number_length,
-                   const char* encrypted_buffer,
-                   QuicPacketLength encrypted_length,
-                   bool has_ack,
-                   bool has_stop_waiting);
-  SerializedPacket(const SerializedPacket& other);
-  ~SerializedPacket();
-
-  // Not owned.
-  const char* encrypted_buffer;
-  QuicPacketLength encrypted_length;
-  QuicFrames retransmittable_frames;
-  IsHandshake has_crypto_handshake;
-  // -1: full padding to the end of a max-sized packet
-  //  0: no padding
-  //  otherwise: only pad up to num_padding_bytes bytes
-  int16_t num_padding_bytes;
-  QuicPathId path_id;
-  QuicPacketNumber packet_number;
-  QuicPacketNumberLength packet_number_length;
-  EncryptionLevel encryption_level;
-  bool has_ack;
-  bool has_stop_waiting;
-  TransmissionType transmission_type;
-  QuicPathId original_path_id;
-  QuicPacketNumber original_packet_number;
-
-  // Optional notifiers which will be informed when this packet has been ACKed.
-  std::list<AckListenerWrapper> listeners;
-};
-
-// Deletes and clears all the frames and the packet from serialized packet.
-NET_EXPORT_PRIVATE void ClearSerializedPacket(
-    SerializedPacket* serialized_packet);
-
-// Allocates a new char[] of size |packet.encrypted_length| and copies in
-// |packet.encrypted_buffer|.
-NET_EXPORT_PRIVATE char* CopyBuffer(const SerializedPacket& packet);
-
-struct NET_EXPORT_PRIVATE TransmissionInfo {
-  // Used by STL when assigning into a map.
-  TransmissionInfo();
-
-  // Constructs a Transmission with a new all_transmissions set
-  // containing |packet_number|.
-  TransmissionInfo(EncryptionLevel level,
-                   QuicPacketNumberLength packet_number_length,
-                   TransmissionType transmission_type,
-                   QuicTime sent_time,
-                   QuicPacketLength bytes_sent,
-                   bool has_crypto_handshake,
-                   int num_padding_bytes);
-
-  TransmissionInfo(const TransmissionInfo& other);
-
-  ~TransmissionInfo();
-
-  QuicFrames retransmittable_frames;
-  EncryptionLevel encryption_level;
-  QuicPacketNumberLength packet_number_length;
-  QuicPacketLength bytes_sent;
-  QuicTime sent_time;
-  // Reason why this packet was transmitted.
-  TransmissionType transmission_type;
-  // In flight packets have not been abandoned or lost.
-  bool in_flight;
-  // True if the packet can never be acked, so it can be removed.  Occurs when
-  // a packet is never sent, after it is acknowledged once, or if it's a crypto
-  // packet we never expect to receive an ack for.
-  bool is_unackable;
-  // True if the packet contains stream data from the crypto stream.
-  bool has_crypto_handshake;
-  // Non-zero if the packet needs padding if it's retransmitted.
-  int16_t num_padding_bytes;
-  // Stores the packet number of the next retransmission of this packet.
-  // Zero if the packet has not been retransmitted.
-  QuicPacketNumber retransmission;
-  // Non-empty if there is a std::listener for this packet.
-  std::list<AckListenerWrapper> ack_listeners;
-};
-
-// Struct to store the pending retransmission information.
-struct PendingRetransmission {
-  PendingRetransmission(QuicPathId path_id,
-                        QuicPacketNumber packet_number,
-                        TransmissionType transmission_type,
-                        const QuicFrames& retransmittable_frames,
-                        bool has_crypto_handshake,
-                        int num_padding_bytes,
-                        EncryptionLevel encryption_level,
-                        QuicPacketNumberLength packet_number_length)
-      : packet_number(packet_number),
-        retransmittable_frames(retransmittable_frames),
-        transmission_type(transmission_type),
-        path_id(path_id),
-        has_crypto_handshake(has_crypto_handshake),
-        num_padding_bytes(num_padding_bytes),
-        encryption_level(encryption_level),
-        packet_number_length(packet_number_length) {}
-
-  QuicPacketNumber packet_number;
-  const QuicFrames& retransmittable_frames;
-  TransmissionType transmission_type;
-  QuicPathId path_id;
-  bool has_crypto_handshake;
-  int num_padding_bytes;
-  EncryptionLevel encryption_level;
-  QuicPacketNumberLength packet_number_length;
-};
-
-}  // namespace net
-
-#endif  // NET_QUIC_QUIC_PROTOCOL_H_