diff --git a/quic/test_tools/simple_data_producer.cc b/quic/test_tools/simple_data_producer.cc
new file mode 100644
index 0000000..ab98fd1
--- /dev/null
+++ b/quic/test_tools/simple_data_producer.cc
@@ -0,0 +1,70 @@
+// Copyright (c) 2017 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.
+
+#include "net/third_party/quiche/src/quic/test_tools/simple_data_producer.h"
+
+#include "net/third_party/quiche/src/quic/core/quic_data_writer.h"
+#include "net/third_party/quiche/src/quic/platform/api/quic_bug_tracker.h"
+#include "net/third_party/quiche/src/quic/platform/api/quic_flags.h"
+#include "net/third_party/quiche/src/quic/platform/api/quic_map_util.h"
+#include "net/third_party/quiche/src/quic/platform/api/quic_ptr_util.h"
+
+namespace quic {
+
+namespace test {
+
+SimpleDataProducer::SimpleDataProducer() {}
+
+SimpleDataProducer::~SimpleDataProducer() {}
+
+void SimpleDataProducer::SaveStreamData(QuicStreamId id,
+                                        const struct iovec* iov,
+                                        int iov_count,
+                                        size_t iov_offset,
+                                        QuicByteCount data_length) {
+  if (data_length == 0) {
+    return;
+  }
+  if (!QuicContainsKey(send_buffer_map_, id)) {
+    send_buffer_map_[id] = QuicMakeUnique<QuicStreamSendBuffer>(&allocator_);
+  }
+  send_buffer_map_[id]->SaveStreamData(iov, iov_count, iov_offset, data_length);
+}
+
+void SimpleDataProducer::SaveCryptoData(EncryptionLevel level,
+                                        QuicStreamOffset offset,
+                                        QuicStringPiece data) {
+  auto key = std::make_pair(level, offset);
+  crypto_buffer_map_[key] = data;
+}
+
+WriteStreamDataResult SimpleDataProducer::WriteStreamData(
+    QuicStreamId id,
+    QuicStreamOffset offset,
+    QuicByteCount data_length,
+    QuicDataWriter* writer) {
+  auto iter = send_buffer_map_.find(id);
+  if (iter == send_buffer_map_.end()) {
+    return STREAM_MISSING;
+  }
+  if (iter->second->WriteStreamData(offset, data_length, writer)) {
+    return WRITE_SUCCESS;
+  }
+  return WRITE_FAILED;
+}
+
+bool SimpleDataProducer::WriteCryptoData(EncryptionLevel level,
+                                         QuicStreamOffset offset,
+                                         QuicByteCount data_length,
+                                         QuicDataWriter* writer) {
+  auto it = crypto_buffer_map_.find(std::make_pair(level, offset));
+  if (it == crypto_buffer_map_.end() || it->second.length() != data_length) {
+    return false;
+  }
+  return writer->WriteStringPiece(it->second);
+}
+
+}  // namespace test
+
+}  // namespace quic