Implement exponential back-off mechanism and enforce it at the URLRequestHttpJob level.

chrome/service/cloud_print/cloud_print_consts.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 CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_CONSTS_H_
 #define CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_CONSTS_H_
 #pragma once
 
 #include "base/basictypes.h"
 
@@ skipping 18 matching lines @@
 extern const char kPrinterCapsHashValue[];
 extern const char kPrinterTagsValue[];
 extern const char kProxyTagPrefix[];
 extern const char kTagsHashTagName[];
 extern const char kDefaultCloudPrintServerUrl[];
 extern const char kGaiaUrl[];
 extern const char kCloudPrintGaiaServiceId[];
 extern const char kSyncGaiaServiceId[];
 extern const char kCloudPrintPushNotificationsSource[];
 extern const char kChromeCloudPrintProxyHeader[];
-extern const char kCloudPrintAPIRetryPolicy[];
-extern const char kJobDataRetryPolicy[];
 extern const char kCloudPrintUserAgent[];
 extern const char kJobFetchReasonStartup[];
 extern const char kJobFetchReasonPoll[];
 extern const char kJobFetchReasonNotified[];
 extern const char kJobFetchReasonQueryMore[];
 
 // Max retry count for job data fetch requests.
 const int kJobDataMaxRetryCount = 5;
-// Look at CloudPrintProxyBackend::Core::CreateDefaultRetryPolicy for default
-// values of the request retry policy.
+// Max retry count (infinity) for API fetch requests.
+const int kCloudPrintAPIMaxRetryCount = -1;
 
 // When we don't have XMPP notifications available, we resort to polling for
 // print jobs. We choose a random interval in seconds between these 2 values.
 const int kMinJobPollIntervalSecs = 5*60;  // 5 minutes in seconds
 const int kMaxJobPollIntervalSecs = 8*60;  // 8 minutes in seconds
 
 #endif  // CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_CONSTS_H_