relnote: QUIC streamable frames can now use a freelist for their packet buffers, Guarded by gfe2_fe…

net/quic/quic_protocol.h

 // Copyright (c) 2012 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_QUIC_PROTOCOL_H_
 #define NET_QUIC_QUIC_PROTOCOL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 722 matching lines @@
 // frame.
 struct NET_EXPORT_PRIVATE QuicMtuDiscoveryFrame {};
 
 class NET_EXPORT_PRIVATE QuicBufferAllocator {
  public:
   virtual ~QuicBufferAllocator();
 
   // Returns or allocates a new buffer of |size|. Never returns null.
   virtual char* New(size_t size) = 0;
 
+  // Returns or allocates a new buffer of |size| if |flag_enable| is true.
+  // Otherwise, returns a buffer that is compatible with this class directly
+  // with operator new. Never returns null.
+  virtual char* New(size_t size, bool flag_enable) = 0;
+
   // Releases a buffer.
   virtual void Delete(char* buffer) = 0;
+
+  // Marks the allocator as being idle. Serves as a hint to notify the allocator
+  // that it should release any resources it's still holding on to.
+  virtual void MarkAllocatorIdle() {}
 };
 
 // Deleter for stream buffers. Copyable to support platforms where the deleter
 // of a unique_ptr must be copyable. Otherwise it would be nice for this to be
 // move-only.
 class NET_EXPORT_PRIVATE StreamBufferDeleter {
  public:
   StreamBufferDeleter() : allocator_(nullptr) {}
   explicit StreamBufferDeleter(QuicBufferAllocator* allocator)
       : allocator_(allocator) {}
@@ skipping 574 matching lines @@
       : iov(iov), iov_count(iov_count), total_length(total_length) {}
 
   const struct iovec* iov;
   const int iov_count;
   const size_t total_length;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_PROTOCOL_H_