Add an opt-out header for HTTP throttling. Never throttle for localhost.

net/url_request/url_request_throttler_entry_interface.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_INTERFACE_H_
 #define NET_URL_REQUEST_URL_REQUEST_THROTTLER_ENTRY_INTERFACE_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/ref_counted.h"
@@ skipping 25 matching lines @@
   // Although it is not mandatory, respecting the value returned by this method
   // is helpful to avoid traffic overload.
   virtual int64 ReserveSendingTimeForNextRequest(
       const base::TimeTicks& earliest_time) = 0;
 
   // Returns the time after which requests are allowed.
   virtual base::TimeTicks GetExponentialBackoffReleaseTime() const = 0;
 
   // This method needs to be called each time a response is received.
   virtual void UpdateWithResponse(
+      const std::string& host,
       const URLRequestThrottlerHeaderInterface* response) = 0;
 
   // Lets higher-level modules, that know how to parse particular response
   // bodies, notify of receiving malformed content for the given URL. This will
   // be handled by the throttler as if an HTTP 5xx response had been received to
   // the request, i.e. it will count as a failure.
   virtual void ReceivedContentWasMalformed() = 0;
 
  protected:
   friend class base::RefCountedThreadSafe<URLRequestThrottlerEntryInterface>;
   virtual ~URLRequestThrottlerEntryInterface() {}
 
  private:
   friend class base::RefCounted<URLRequestThrottlerEntryInterface>;
   DISALLOW_COPY_AND_ASSIGN(URLRequestThrottlerEntryInterface);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_THROTTLER_ENTRY_INTERFACE_H_