Add a constraint on how many requests can be outstanding for any given render (browser-side).

net/url_request/url_request.h

 // Copyright (c) 2006-2008 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_H_
 #define NET_URL_REQUEST_URL_REQUEST_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 234 matching lines @@
   void AppendBytesToUpload(const char* bytes, int bytes_len);
   void AppendFileRangeToUpload(const std::wstring& file_path,
                                uint64 offset, uint64 length);
   void AppendFileToUpload(const std::wstring& file_path) {
     AppendFileRangeToUpload(file_path, 0, kuint64max);
   }
 
   // Set the upload data directly.
   void set_upload(net::UploadData* upload) { upload_ = upload; }
 
+  // Get the upload data directly.
+  net::UploadData* get_upload() { return upload_.get(); }
+
   // Returns true if the request has a non-empty message body to upload.
   bool has_upload() const { return upload_ != NULL; }
 
   // Set an extra request header by ID or name.  These methods may only be
   // called before Start() is called.  It is an error to call it later.
   void SetExtraRequestHeaderById(int header_id, const std::string& value,
                                  bool overwrite);
   void SetExtraRequestHeaderByName(const std::string& name,
                                    const std::string& value, bool overwrite);
 
   // Sets all extra request headers, from a \r\n-delimited string.  Any extra
   // request headers set by other methods are overwritten by this method.  This
   // method may only be called before Start() is called.  It is an error to
   // call it later.
   void SetExtraRequestHeaders(const std::string& headers);
 
+  const std::string& extra_request_headers() { return extra_request_headers_; }
+
   // Returns the current load state for the request.
   net::LoadState GetLoadState() const;
 
   // Returns the current upload progress in bytes.
   uint64 GetUploadProgress() const;
 
   // Get response header(s) by ID or name.  These methods may only be called
   // once the delegate's OnResponseStarted method has been called.  Headers
   // that appear more than once in the response are coalesced, with values
   // separated by commas (per RFC 2616). This will not work with cookies since
@@ skipping 238 matching lines @@
 #else  // disable leak checking in release builds...
 
 #define URLREQUEST_COUNT_CTOR()
 #define URLREQUEST_COUNT_DTOR()
 
 #endif
 
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_H_