Introduces QuicStreamSequencerBufferInterface with one implementation. Refactor, no behavior change.

net/net.gypi

 # Copyright 2014 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.
 
 # This file is shared between the regular GYP build, the NaCl GYP build, and
 # the GN build. For GN support, it must have no conditionals or anything like
 # that beyond the simple one-level-deep dictionary of values.
 {
   'variables': {
     # Subset of net source files that are compiled for NaCl (net_nacl target).
@@ skipping 344 matching lines @@
       'quic/quic_sent_packet_manager.cc',
       'quic/quic_sent_packet_manager.h',
       'quic/quic_server_id.cc',
       'quic/quic_server_id.h',
       'quic/quic_session.cc',
       'quic/quic_session.h',
       'quic/quic_socket_address_coder.cc',
       'quic/quic_socket_address_coder.h',
       'quic/quic_stream_sequencer.cc',
       'quic/quic_stream_sequencer.h',
+      'quic/quic_stream_sequencer_buffer_interface.h',
       'quic/quic_sustained_bandwidth_recorder.cc',
       'quic/quic_sustained_bandwidth_recorder.h',
       'quic/quic_time.cc',
       'quic/quic_time.h',
       'quic/quic_types.cc',
       'quic/quic_types.h',
       'quic/quic_unacked_packet_map.cc',
       'quic/quic_unacked_packet_map.h',
       'quic/quic_utils.cc',
       'quic/quic_utils.h',
@@ skipping 1522 matching lines @@
       'docs/bug-triage.md',
       'docs/bug-triage-labels.md',
       'docs/bug-triage-suggested-workflow.md',
       'docs/code-patterns.md',
       'docs/life-of-a-url-request.md',
       'sdch/README.md',
     ],
     'net_docs_output_dir': '<(PRODUCT_DIR)/net/docs',
   }
 }