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

net/quic/test_tools/quic_stream_sequencer_peer.h

 // 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.
 
 #ifndef NET_QUIC_TEST_TOOLS_QUIC_STREAM_SEQUENCER_PEER_H_
 #define NET_QUIC_TEST_TOOLS_QUIC_STREAM_SEQUENCER_PEER_H_
 
 #include "base/basictypes.h"
+#include "net/quic/quic_frame_list.h"
 #include "net/quic/quic_protocol.h"
 
 namespace net {
 
 class QuicStreamSequencer;
 
 namespace test {
 
 class QuicStreamSequencerPeer {
  public:
-  static size_t GetNumBufferedFrames(QuicStreamSequencer* sequencer);
+  static size_t GetNumBufferedBytes(QuicStreamSequencer* sequencer);
 
-  static bool FrameOverlapsBufferedData(QuicStreamSequencer* sequencer,
+  static bool FrameOverlapsBufferedData(QuicFrameList* buffer,
                                         const QuicStreamFrame& frame);
 
   static QuicStreamOffset GetCloseOffset(QuicStreamSequencer* sequencer);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(QuicStreamSequencerPeer);
 };
 
 }  // namespace test
 }  // namespace net
 
 #endif  // NET_QUIC_TEST_TOOLS_QUIC_STREAM_SEQUENCER_PEER_H_