Split out QuicAlarm creation from QuicConnectionHelper to new QuicAlarmFactory.

net/tools/quic/test_tools/packet_dropping_test_writer.h

 // Copyright 2013 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_TOOLS_QUIC_TEST_TOOLS_PACKET_DROPPING_TEST_WRITER_H_
 #define NET_TOOLS_QUIC_TEST_TOOLS_PACKET_DROPPING_TEST_WRITER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 26 matching lines @@
 
   PacketDroppingTestWriter();
 
   ~PacketDroppingTestWriter() override;
 
   // Must be called before blocking, reordering or delaying (loss is OK). May be
   // called after connecting if the helper is not available before.
   // |on_can_write| will be triggered when fake-unblocking; ownership will be
   // assumed.
   void Initialize(QuicConnectionHelperInterface* helper,
+                  QuicAlarmFactory* alarm_factory,
                   Delegate* on_can_write);
 
   // QuicPacketWriter methods:
   WriteResult WritePacket(const char* buffer,
                           size_t buf_len,
                           const IPAddress& self_address,
                           const IPEndPoint& peer_address,
                           PerPacketOptions* options) override;
 
   bool IsWriteBlocked() const override;
@@ skipping 113 matching lines @@
   QuicBandwidth fake_bandwidth_;
   QuicByteCount buffer_size_;
 
   DISALLOW_COPY_AND_ASSIGN(PacketDroppingTestWriter);
 };
 
 }  // namespace test
 }  // namespace net
 
 #endif  // NET_TOOLS_QUIC_TEST_TOOLS_PACKET_DROPPING_TEST_WRITER_H_