Release read buffer of QuicCryptoStream when incoming message become less frequent. Protected by --…

net/quic/test_tools/quic_stream_sequencer_buffer_peer.h

+// Copyright 2016 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_BUFFER_PEER_H_
+#define NET_QUIC_TEST_TOOLS_QUIC_STREAM_SEQUENCER_BUFFER_PEER_H_
+
+#include "net/quic/core/quic_stream_sequencer_buffer.h"
+
+namespace net {
+
+namespace test {
+
+class QuicStreamSequencerBufferPeer {
+ public:
+  explicit QuicStreamSequencerBufferPeer(
+      net::QuicStreamSequencerBuffer* buffer);
+
+  // Read from this buffer_ into the given destination buffer_ up to the
+  // size of the destination. Returns the number of bytes read. Reading from
+  // an empty buffer_->returns 0.
+  size_t Read(char* dest_buffer, size_t size);
+
+  // If buffer is empty, the blocks_ array must be empty, which means all
+  // blocks are deallocated.
+  bool CheckEmptyInvariants();
+
+  bool IsBlockArrayEmpty();
+
+  bool CheckInitialState();
+
+  bool CheckBufferInvariants();
+
+  size_t GetInBlockOffset(QuicStreamOffset offset);
+
+  net::QuicStreamSequencerBuffer::BufferBlock* GetBlock(size_t index);
+
+  int GapSize();
+
+  std::list<net::QuicStreamSequencerBuffer::Gap> GetGaps();
+
+  size_t max_buffer_capacity();
+
+  size_t ReadableBytes();
+
+  std::map<QuicStreamOffset, net::QuicStreamSequencerBuffer::FrameInfo>*
+  frame_arrival_time_map();
+
+  void set_total_bytes_read(QuicStreamOffset total_bytes_read);
+
+  void set_gaps(const std::list<net::QuicStreamSequencerBuffer::Gap>& gaps);
+
+  bool IsBufferAllocated();
+
+ private:
+  net::QuicStreamSequencerBuffer* buffer_;
+  DISALLOW_COPY_AND_ASSIGN(QuicStreamSequencerBufferPeer);
+};
+
+}  // namespace test
+}  // namespace net
+
+#endif  // NET_QUIC_TEST_TOOLS_QUIC_STREAM_SEQUENCER_BUFFER_PEER_H_