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

chrome/service/cloud_print/printer_job_handler.cc

Index: chrome/service/cloud_print/printer_job_handler.cc
===================================================================
--- chrome/service/cloud_print/printer_job_handler.cc	(revision 66188)
+++ chrome/service/cloud_print/printer_job_handler.cc	(working copy)
@@ -91,7 +91,7 @@
         request_->StartGetRequest(
             CloudPrintHelpers::GetUrlForPrinterDelete(
                 cloud_print_server_url_, printer_info_cloud_.printer_id),
-            this, auth_token_, kCloudPrintAPIRetryPolicy);
+            this, auth_token_, kCloudPrintAPIMaxRetryCount);
       }
       if (!task_in_progress_ && printer_update_pending_) {
         printer_update_pending_ = false;
@@ -106,7 +106,7 @@
         request_->StartGetRequest(
             CloudPrintHelpers::GetUrlForJobFetch(
                 cloud_print_server_url_, printer_info_cloud_.printer_id),
-            this, auth_token_, kCloudPrintAPIRetryPolicy);
+            this, auth_token_, kCloudPrintAPIMaxRetryCount);
       }
     }
   }
@@ -206,7 +206,7 @@
     request_->StartPostRequest(
         CloudPrintHelpers::GetUrlForPrinterUpdate(
             cloud_print_server_url_, printer_info_cloud_.printer_id),
-        this, auth_token_, kCloudPrintAPIRetryPolicy, mime_type, post_data);
+        this, auth_token_, kCloudPrintAPIMaxRetryCount, mime_type, post_data);
     ret = true;
   }
   return ret;
@@ -347,7 +347,7 @@
         request_->StartGetRequest(GURL(print_ticket_url.c_str()),
                                   this,
                                   auth_token_,
-                                  kCloudPrintAPIRetryPolicy);
+                                  kCloudPrintAPIMaxRetryCount);
       }
     }
   }
@@ -371,7 +371,7 @@
     request_->StartGetRequest(GURL(print_data_url_.c_str()),
                               this,
                               auth_token_,
-                              kJobDataRetryPolicy);
+                              kJobDataMaxRetryCount);
   } else {
     // The print ticket was not valid. We are done here.
     FailedFetchingJobData();
@@ -519,7 +519,7 @@
                                                       status),
           this,
           auth_token_,
-          kCloudPrintAPIRetryPolicy);
+          kCloudPrintAPIMaxRetryCount);
     }
   }
 }