Refactoring: Create per-connection packet writers in QuicDispatcher.

net/quic/quic_per_connection_packet_writer.cc

Index: net/quic/quic_per_connection_packet_writer.cc
diff --git a/net/quic/quic_per_connection_packet_writer.cc b/net/quic/quic_per_connection_packet_writer.cc
index 6347bc201df632e68de7aac05a19a63584179edf..4185a4f6377893107424636f51e1d2008dee608c 100644
--- a/net/quic/quic_per_connection_packet_writer.cc
+++ b/net/quic/quic_per_connection_packet_writer.cc
@@ -10,8 +10,11 @@
 namespace net {
 
 QuicPerConnectionPacketWriter::QuicPerConnectionPacketWriter(
-    QuicServerPacketWriter* writer)
-    : weak_factory_(this), writer_(writer) {
+    QuicServerPacketWriter* shared_writer,
+    QuicConnection* connection)
+    : weak_factory_(this),
+      shared_writer_(shared_writer),
+      connection_(connection) {
 }
 
 QuicPerConnectionPacketWriter::~QuicPerConnectionPacketWriter() {
@@ -22,7 +25,7 @@ WriteResult QuicPerConnectionPacketWriter::WritePacket(
     size_t buf_len,
     const IPAddressNumber& self_address,
     const IPEndPoint& peer_address) {
-  return writer_->WritePacketWithCallback(
+  return shared_writer_->WritePacketWithCallback(
       buffer,
       buf_len,
       self_address,
@@ -32,15 +35,15 @@ WriteResult QuicPerConnectionPacketWriter::WritePacket(
 }
 
 bool QuicPerConnectionPacketWriter::IsWriteBlockedDataBuffered() const {
-  return writer_->IsWriteBlockedDataBuffered();
+  return shared_writer_->IsWriteBlockedDataBuffered();
 }
 
 bool QuicPerConnectionPacketWriter::IsWriteBlocked() const {
-  return writer_->IsWriteBlocked();
+  return shared_writer_->IsWriteBlocked();
 }
 
 void QuicPerConnectionPacketWriter::SetWritable() {
-  writer_->SetWritable();
+  shared_writer_->SetWritable();
 }
 
 void QuicPerConnectionPacketWriter::OnWriteComplete(WriteResult result) {