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

net/url_request/url_request_throttler_entry.cc

 // Copyright (c) 2011 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.
 
 #include "net/url_request/url_request_throttler_entry.h"
 
 #include <cmath>
 
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/rand_util.h"
 #include "base/string_number_conversions.h"
 #include "base/values.h"
+#include "net/base/load_flags.h"
 #include "net/base/net_log.h"
 #include "net/url_request/url_request_throttler_header_interface.h"
 #include "net/url_request/url_request_throttler_manager.h"
 
 namespace net {
 
 const int URLRequestThrottlerEntry::kDefaultSlidingWindowPeriodMs = 2000;
 const int URLRequestThrottlerEntry::kDefaultMaxSendThreshold = 20;
 
 // This set of back-off parameters will (at maximum values, i.e. without
@@ skipping 146 matching lines @@
 }
 
 void URLRequestThrottlerEntry::DisableBackoffThrottling() {
   is_backoff_disabled_ = true;
 }
 
 void URLRequestThrottlerEntry::DetachManager() {
   manager_ = NULL;
 }
 
-bool URLRequestThrottlerEntry::IsDuringExponentialBackoff() const {
+bool URLRequestThrottlerEntry::ShouldRejectRequest(int load_flags) const {
   bool reject_request = false;
-  if (!is_backoff_disabled_ && GetBackoffEntry()->ShouldRejectRequest()) {
+  if (!is_backoff_disabled_ && !ExplicitUserRequest(load_flags) &&
+      GetBackoffEntry()->ShouldRejectRequest()) {
     int num_failures = GetBackoffEntry()->failure_count();
     int release_after_ms =
         (GetBackoffEntry()->GetReleaseTime() - base::TimeTicks::Now())
             .InMilliseconds();
 
     net_log_.AddEvent(
         NetLog::TYPE_THROTTLING_REJECTED_REQUEST,
         make_scoped_refptr(
             new RejectedRequestParameters(url_id_,
                                           num_failures,
@@ skipping 243 matching lines @@
 }
 
 const BackoffEntry* URLRequestThrottlerEntry::GetBackoffEntry() const {
   return &backoff_entry_;
 }
 
 BackoffEntry* URLRequestThrottlerEntry::GetBackoffEntry() {
   return &backoff_entry_;
 }
 
+// static
+bool URLRequestThrottlerEntry::ExplicitUserRequest(const int load_flags) {
+  return (load_flags & LOAD_MAYBE_USER_GESTURE) != 0;
+}
+
 }  // namespace net