Define Stable API for WebRTC/Quartc

net/quic/quartc/quartc_packet_writer.h

Index: net/quic/quartc/quartc_packet_writer.h
diff --git a/net/quic/quartc/quartc_packet_writer.h b/net/quic/quartc/quartc_packet_writer.h
new file mode 100644
index 0000000000000000000000000000000000000000..bbfd689b9a5fe5f9d8cfd838bcdbe5b5f0777036
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+++ b/net/quic/quartc/quartc_packet_writer.h
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+// Copyright (c) 2016 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_QUARTC_QUARTC_PACKET_WRITER_H_
+#define NET_QUIC_QUARTC_QUARTC_PACKET_WRITER_H_
+
+#include "net/quic/core/quic_packet_writer.h"
+#include "net/quic/quartc/quartc_session_interface.h"
+
+namespace net {
+
+// Implements a QuicPacketWriter using a
+// QuartcSessionInterface::PacketTransport, which allows a QuicConnection to
+// use(for example), a WebRTC IceTransport.
+class NET_EXPORT_PRIVATE QuartcPacketWriter : public QuicPacketWriter {
+ public:
+  QuartcPacketWriter(QuartcSessionInterface::PacketTransport* packet_transport,
+                     QuicByteCount max_packet_size);
+  ~QuartcPacketWriter() override {}
+
+  // The QuicConnection calls WritePacket and the QuicPacketWriter writes them
+  // to the QuartcSessionInterface::PacketTransport.
+  WriteResult WritePacket(const char* buffer,
+                          size_t buf_len,
+                          const IPAddress& self_address,
+                          const IPEndPoint& peer_address,
+                          PerPacketOptions* options) override;
+
+  // This is always set to false so that QuicConnection buffers unsent packets.
+  bool IsWriteBlockedDataBuffered() const override;
+
+  // Whether the underneath |transport_| is blocked. If this returns true,
+  // outgoing QUIC packets are queued by QuicConnection until
+  // Transport::Observer::OnCanWrite() is called.
+  bool IsWriteBlocked() const override;
+
+  // Maximum size of the QUIC packet which can be written. Users such as WebRTC
+  // can set the value through the QuartcFactoryConfig without updating the QUIC
+  // code.
+  QuicByteCount GetMaxPacketSize(const IPEndPoint& peer_address) const override;
+
+  // This method is not used because the network layer in WebRTC will determine
+  // the writing states.
+  void SetWritable() override;
+
+ private:
+  // QuartcPacketWriter will not own the transport.
+  QuartcSessionInterface::PacketTransport* packet_transport_;
+  // The maximum size of the packet can be written by this writer.
+  QuicByteCount max_packet_size_;
+};
+
+}  // namespace net
+
+#endif  // NET_QUIC_QUARTC_QUARTC_PACKET_WRITER_H_