AU: Implement exponential back off for 500 and 503 HTTP response codes.

update_attempter_mock.h

Index: update_attempter_mock.h
diff --git a/update_attempter_mock.h b/update_attempter_mock.h
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+// Copyright (c) 2010 The Chromium OS 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 CHROMEOS_PLATFORM_UPDATE_ENGINE_UPDATE_ATTEMPTER_MOCK_H__
+#define CHROMEOS_PLATFORM_UPDATE_ENGINE_UPDATE_ATTEMPTER_MOCK_H__
+
+#include <gmock/gmock.h>
+
+#include "update_engine/update_attempter.h"
+
+namespace chromeos_update_engine {
+
+class UpdateAttempterMock : public UpdateAttempter {
+ public:
+  UpdateAttempterMock() : UpdateAttempter(NULL, NULL) {}
+
+  MOCK_METHOD2(Update, void(const std::string& app_version,
+                            const std::string& omaha_url));
+};
+
+}  // namespace chromeos_update_engine
+
+#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_UPDATE_ATTEMPTER_MOCK_H__