Add load flag indicating a request is probably the result of a user gesture.

net/url_request/url_request_throttler_entry_interface.h

Index: net/url_request/url_request_throttler_entry_interface.h
diff --git a/net/url_request/url_request_throttler_entry_interface.h b/net/url_request/url_request_throttler_entry_interface.h
index 86feb9f659d041b197c4130ed0cf495555e88fa6..b09ddcc74f186b0a75b8e1517f960a7960f44128 100644
--- a/net/url_request/url_request_throttler_entry_interface.h
+++ b/net/url_request/url_request_throttler_entry_interface.h
@@ -24,10 +24,13 @@ class NET_API URLRequestThrottlerEntryInterface
   URLRequestThrottlerEntryInterface() {}
 
   // Returns true when we have encountered server errors and are doing
-  // exponential back-off.
+  // exponential back-off, unless the request has |load_flags| (from
+  // net/base/load_flags.h) that mean it is likely to be
+  // user-initiated.
+  //
   // URLRequestHttpJob checks this method prior to every request; it
   // cancels requests if this method returns true.
-  virtual bool IsDuringExponentialBackoff() const = 0;
+  virtual bool ShouldRejectRequest(int load_flags) const = 0;
 
   // Calculates a recommended sending time for the next request and reserves it.
   // The sending time is not earlier than the current exponential back-off