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

net/url_request/url_request_throttler_entry.h

 // 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.
 
 #ifndef NET_URL_REQUEST_URL_REQUEST_THROTTLER_ENTRY_H_
 #define NET_URL_REQUEST_URL_REQUEST_THROTTLER_ENTRY_H_
 #pragma once
 
 #include <queue>
 #include <string>
@@ skipping 79 matching lines @@
   // collected.
   bool IsEntryOutdated() const;
 
   // Causes this entry to never reject requests due to back-off.
   void DisableBackoffThrottling();
 
   // Causes this entry to NULL its manager pointer.
   void DetachManager();
 
   // Implementation of URLRequestThrottlerEntryInterface.
-  virtual bool IsDuringExponentialBackoff() const;
+  virtual bool ShouldRejectRequest(int load_flags) const;
   virtual int64 ReserveSendingTimeForNextRequest(
       const base::TimeTicks& earliest_time);
   virtual base::TimeTicks GetExponentialBackoffReleaseTime() const;
   virtual void UpdateWithResponse(
       const std::string& host,
       const URLRequestThrottlerHeaderInterface* response);
   virtual void ReceivedContentWasMalformed(int response_code);
 
  protected:
   virtual ~URLRequestThrottlerEntry();
@@ skipping 16 matching lines @@
 
   // Used internally to keep track of failure->success transitions and
   // generate statistics about them.
   void HandleMetricsTracking(int response_code);
 
   // Retrieves the back-off entry object we're using. Used to enable a
   // unit testing seam for dependency injection in tests.
   virtual const BackoffEntry* GetBackoffEntry() const;
   virtual BackoffEntry* GetBackoffEntry();
 
+  // Returns true if |load_flags| contains a flag that indicates an
+  // explicit request by the user to load the resource. We never
+  // throttle requests with such load flags.
+  static bool ExplicitUserRequest(const int load_flags);
+
   // Used by tests.
   base::TimeTicks sliding_window_release_time() const {
     return sliding_window_release_time_;
   }
 
   // Used by tests.
   void set_sliding_window_release_time(const base::TimeTicks& release_time) {
     sliding_window_release_time_ = release_time;
   }
 
@@ skipping 35 matching lines @@
   std::string url_id_;
 
   BoundNetLog net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestThrottlerEntry);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_THROTTLER_ENTRY_H_