Automatically retry failed network requests.

net/url_request/url_request_http_job.h

Index: net/url_request/url_request_http_job.h
===================================================================
--- net/url_request/url_request_http_job.h	(revision 152047)
+++ net/url_request/url_request_http_job.h	(working copy)
@@ -64,6 +64,12 @@
 
   void RestartTransactionWithAuth(const AuthCredentials& credentials);
 
+  void RetryRequestOnError(int result);
+
+  // Returns true if this request should be retried after receiving the given
+  // error as a result of a call to Start.
+  bool ShouldRetryRequest(int result) const;
+
   // Overridden from URLRequestJob:
   virtual void SetUpload(UploadData* upload) OVERRIDE;
   virtual void SetExtraRequestHeaders(
@@ -149,6 +155,8 @@
   void RecordTimer();
   void ResetTimer();
 
+  void RecordRetryResult(int result) const;
+
   virtual void UpdatePacketReadTimes() OVERRIDE;
   void RecordPacketStats(FilterContext::StatisticSelector statistic) const;
 
@@ -240,6 +248,15 @@
 
   scoped_ptr<HttpTransactionDelegateImpl> http_transaction_delegate_;
 
+  // True if the request job has automatically retried the request as a result
+  // of an error.
+  bool has_retried_;
+
+  // The network error code error that |this| was automatically retried as a
+  // result of, if any.  If this request has not been retried, must be 0.
+  // Reset once it's been used to log histograms.
+  int error_before_retry_;
+
   DISALLOW_COPY_AND_ASSIGN(URLRequestHttpJob);
 };