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

net/quic/quic_protocol.cc

Index: net/quic/quic_protocol.cc
diff --git a/net/quic/quic_protocol.cc b/net/quic/quic_protocol.cc
index a5fb29cf2dd31738bf94dcd20587fd2a43b82a81..e683b4d3ad951becfb7f5b4e16d570a2620d119e 100644
--- a/net/quic/quic_protocol.cc
+++ b/net/quic/quic_protocol.cc
@@ -106,13 +106,17 @@ QuicBufferAllocator::~QuicBufferAllocator() = default;
 void StreamBufferDeleter::operator()(char* buffer) const {
   if (allocator_ != nullptr && buffer != nullptr) {
     allocator_->Delete(buffer);
+    if (!FLAGS_use_stream_frame_freelist) {
+      allocator_->MarkAllocatorIdle();
+    }
   }
 }
 
 UniqueStreamBuffer NewStreamBuffer(QuicBufferAllocator* allocator,
                                    size_t size) {
-  return UniqueStreamBuffer(allocator->New(size),
-                            StreamBufferDeleter(allocator));
+  return UniqueStreamBuffer(
+      allocator->New(size, FLAGS_use_stream_frame_freelist),
+      StreamBufferDeleter(allocator));
 }
 
 QuicStreamFrame::QuicStreamFrame()