diff --git a/quic/core/quic_bandwidth.cc b/quic/core/quic_bandwidth.cc
new file mode 100644
index 0000000..cdcf003
--- /dev/null
+++ b/quic/core/quic_bandwidth.cc
@@ -0,0 +1,40 @@
+// 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.
+
+#include "net/third_party/quiche/src/quic/core/quic_bandwidth.h"
+
+#include <cinttypes>
+
+#include "net/third_party/quiche/src/quic/platform/api/quic_str_cat.h"
+#include "net/third_party/quiche/src/quic/platform/api/quic_string.h"
+
+namespace quic {
+
+QuicString QuicBandwidth::ToDebugValue() const {
+  if (bits_per_second_ < 80000) {
+    return QuicStringPrintf("%" PRId64 " bits/s (%" PRId64 " bytes/s)",
+                            bits_per_second_, bits_per_second_ / 8);
+  }
+
+  double divisor;
+  char unit;
+  if (bits_per_second_ < 8 * 1000 * 1000) {
+    divisor = 1e3;
+    unit = 'k';
+  } else if (bits_per_second_ < INT64_C(8) * 1000 * 1000 * 1000) {
+    divisor = 1e6;
+    unit = 'M';
+  } else {
+    divisor = 1e9;
+    unit = 'G';
+  }
+
+  double bits_per_second_with_unit = bits_per_second_ / divisor;
+  double bytes_per_second_with_unit = bits_per_second_with_unit / 8;
+  return QuicStringPrintf("%.2f %cbits/s (%.2f %cbytes/s)",
+                          bits_per_second_with_unit, unit,
+                          bytes_per_second_with_unit, unit);
+}
+
+}  // namespace quic