This CL will introduce a new way to do exponential back-off on failure within...

net/request_throttler/request_throttler_header_adapter.cc

+// Copyright (c) 2010 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/request_throttler/request_throttler_header_adapter.h"
+
+RequestThrottlerHeaderAdapter::RequestThrottlerHeaderAdapter(
+    const scoped_refptr<net::HttpResponseHeaders>& headers)
+    : response_header_(headers) {
+}
+
+std::string RequestThrottlerHeaderAdapter::GetNormalizedValue(
+    const std::string& key) const {
+  std::string return_value;
+  response_header_->GetNormalizedHeader(key, &return_value);
+  return return_value;
+}
+
+int RequestThrottlerHeaderAdapter::GetResponseCode() const {
+  return response_header_->response_code();
+}