Make Quic client more memory efficient. Protected by --quic_headers_stream_release_sequencer_buffer.

net/quic/core/quic_headers_stream.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_QUIC_CORE_QUIC_HEADERS_STREAM_H_
 #define NET_QUIC_CORE_QUIC_HEADERS_STREAM_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 77 matching lines @@
   void SetHpackDecoderDebugVisitor(std::unique_ptr<HpackDebugVisitor> visitor);
 
   // Sets the maximum size of the header compression table spdy_framer_ is
   // willing to use to decode header blocks.
   void UpdateHeaderEncoderTableSize(uint32_t value);
 
   // Called when SETTINGS_ENABLE_PUSH is received, only supported on
   // server side.
   void UpdateEnableServerPush(bool value);
 
+  // Release underlying buffer if allowed.
+  void MaybeReleaseSequencerBuffer();
+
   // Sets how much encoded data the hpack decoder of spdy_framer_ is willing to
   // buffer.
   void set_max_decode_buffer_size_bytes(size_t max_decode_buffer_size_bytes) {
     spdy_framer_.set_max_decode_buffer_size_bytes(max_decode_buffer_size_bytes);
   }
 
   void set_max_uncompressed_header_bytes(
       size_t set_max_uncompressed_header_bytes);
 
  private:
@@ skipping 51 matching lines @@
 
   SpdyFramer spdy_framer_;
   std::unique_ptr<SpdyFramerVisitor> spdy_framer_visitor_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicHeadersStream);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CORE_QUIC_HEADERS_STREAM_H_