Coalesce small buffers in net::BidirectionalStream

net/quic/quic_chromium_client_stream.cc

Index: net/quic/quic_chromium_client_stream.cc
diff --git a/net/quic/quic_chromium_client_stream.cc b/net/quic/quic_chromium_client_stream.cc
index 06ec9426df6353c443be8cf3ff5f3162b7d5a2ae..bc53e94c13387ea966722c8e5304c05a9352290f 100644
--- a/net/quic/quic_chromium_client_stream.cc
+++ b/net/quic/quic_chromium_client_stream.cc
@@ -138,6 +138,24 @@ int QuicChromiumClientStream::WriteStreamData(
   callback_ = callback;
   return ERR_IO_PENDING;
 }
+int QuicChromiumClientStream::WritevStreamData(
+    const std::vector<base::StringPiece>& data,
+    bool fin,
+    const CompletionCallback& callback) {
+  // We should not have data buffered.
+  DCHECK(!HasBufferedData());
+  // Writes the data, or buffers it.
+  for (size_t i = 0; i < data.size(); ++i) {
+    bool is_fin = fin && (i == data.size() - 1);
+    WriteOrBufferData(data[i], is_fin, nullptr);
+  }
+  if (!HasBufferedData()) {
+    return OK;
+  }
+
+  callback_ = callback;
+  return ERR_IO_PENDING;
+}
 
 void QuicChromiumClientStream::SetDelegate(
     QuicChromiumClientStream::Delegate* delegate) {