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

net/request_throttler/request_throttler_header_adapter.h

+// 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.
+
+#ifndef NET_REQUEST_THROTTLER_REQUEST_THROTTLER_HEADER_ADAPTER_H_
+#define NET_REQUEST_THROTTLER_REQUEST_THROTTLER_HEADER_ADAPTER_H_
+
+#include <string>
+
+#include "base/scoped_ptr.h"
+#include "net/http/http_response_headers.h"
+#include "net/request_throttler/request_throttler_header_interface.h"
+
+namespace net {
+class HttpResponseHeaders;
+}
+
+// Adapter for the http header interface of the request throttler component.
+class RequestThrottlerHeaderAdapter : public RequestThrottlerHeaderInterface {
+ public:
+  RequestThrottlerHeaderAdapter(
+      const scoped_refptr<net::HttpResponseHeaders>& headers);
+  virtual ~RequestThrottlerHeaderAdapter() {}
+
+  // Implementation of the Http header interface
+  virtual std::string GetNormalizedValue(const std::string& key) const;
+  virtual int GetResponseCode() const;
+ private:
+  const scoped_refptr<net::HttpResponseHeaders> response_header_;
+};
+
+#endif  // NET_REQUEST_THROTTLER_REQUEST_THROTTLER_HEADER_ADAPTER_H_