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
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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 {
+
+// This class writes the packets to network layer with a |transport_| which will
+// be implemented on WebRTC side.
+class NET_EXPORT_PRIVATE QuartcPacketWriter : public QuicPacketWriter {
+ public:
+  QuartcPacketWriter(QuartcSessionInterface::Transport* transport);
+  ~QuartcPacketWriter() override {}
+
+  // Called from QuicConnection when the session has packets to write.
+  WriteResult WritePacket(const char* buffer,
+                          size_t buf_len,
+                          const IPAddress& self_address,
+                          const IPEndPoint& peer_address,
+                          PerPacketOptions* options) override;
+  // If this is set to false, then 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.
+  QuicByteCount GetMaxPacketSize(const IPEndPoint& peer_address) const override;
+  // This method is not used because the network layer in WebRTC will determine
+  // the write states.
+  void SetWritable() override;
+
+ private:
+  // QuartcPacketWriter will not own the transport.
+  QuartcSessionInterface::Transport* transport_ = nullptr;
+};
+
+}  // namespace net
+
+#endif  // NET_QUIC_QUARTC_QUARTC_PACKET_WRITER_H_