Remove dependency on headers stream from QuicSession.

net/quic/quic_spdy_session.cc

+// Copyright (c) 2015 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.
+
+#include "net/quic/quic_spdy_session.h"
+
+#include "net/quic/quic_headers_stream.h"
+
+namespace net {
+
+QuicSpdySession::QuicSpdySession(QuicConnection* connection,
+                                 const QuicConfig& config)
+    : QuicSession(connection, config) {
+}
+
+QuicSpdySession::~QuicSpdySession() {
+}
+
+void QuicSpdySession::Initialize() {
+  QuicSession::Initialize();
+
+  if (perspective() == Perspective::IS_SERVER) {
+    set_largest_peer_created_stream_id(kHeadersStreamId);
+  } else {
+    QuicStreamId headers_stream_id = GetNextStreamId();
+    DCHECK_EQ(headers_stream_id, kHeadersStreamId);
+  }
+
+  headers_stream_.reset(new QuicHeadersStream(this));
+  DCHECK_EQ(kHeadersStreamId, headers_stream_->id());
+  static_streams()[kHeadersStreamId] = headers_stream_.get();
+}
+
+void QuicSpdySession::OnStreamHeaders(QuicStreamId stream_id,
+                                      StringPiece headers_data) {
+  QuicDataStream* stream = GetSpdyDataStream(stream_id);
+  if (!stream) {
+    // It's quite possible to receive headers after a stream has been reset.
+    return;
+  }
+  stream->OnStreamHeaders(headers_data);
+}
+
+void QuicSpdySession::OnStreamHeadersPriority(QuicStreamId stream_id,
+                                              QuicPriority priority) {
+  QuicDataStream* stream = GetSpdyDataStream(stream_id);
+  if (!stream) {
+    // It's quite possible to receive headers after a stream has been reset.
+    return;
+  }
+  stream->OnStreamHeadersPriority(priority);
+}
+
+void QuicSpdySession::OnStreamHeadersComplete(QuicStreamId stream_id,
+                                              bool fin,
+                                              size_t frame_len) {
+  QuicDataStream* stream = GetSpdyDataStream(stream_id);
+  if (!stream) {
+    // It's quite possible to receive headers after a stream has been reset.
+    return;
+  }
+  stream->OnStreamHeadersComplete(fin, frame_len);
+}
+
+size_t QuicSpdySession::WriteHeaders(
+    QuicStreamId id,
+    const SpdyHeaderBlock& headers,
+    bool fin,
+    QuicPriority priority,
+    QuicAckNotifier::DelegateInterface* ack_notifier_delegate) {
+  return headers_stream_->WriteHeaders(id, headers, fin, priority,
+                                       ack_notifier_delegate);
+}
+
+QuicDataStream* QuicSpdySession::GetSpdyDataStream(
+    const QuicStreamId stream_id) {
+  return static_cast<QuicDataStream*>(GetDynamicStream(stream_id));
+}
+
+}  // namespace net