Revert of Remove support for GlobalNetworkClientFactory from RequestTracker.

ios/net/request_tracker.h

 // Copyright 2012 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 IOS_NET_REQUEST_TRACKER_H_
 #define IOS_NET_REQUEST_TRACKER_H_
 
 #import <Foundation/Foundation.h>
 #include <stdint.h>
 
@@ skipping 61 matching lines @@
 
   base::WeakPtr<RequestTracker> GetWeakPtr();
 
   // This function has to be called before using the tracker.
   virtual void Init();
 
   // Add a factory that may create network clients for requests going through
   // this tracker.
   void AddNetworkClientFactory(CRNForwardingNetworkClientFactory* factory);
 
+  // Registers a factory with the class that will be added to all trackers.
+  // Requests without associated trackers can add clients from these factories
+  // using GlobalClientsHandlingAnyRequest().
+  // Only |-clientHandlingAnyRequest| will be called on |factory|, the other
+  // methods are not supported.
+  static void AddGlobalNetworkClientFactory(
+      CRNForwardingNetworkClientFactory* factory);
+
   // Gets the request context associated with the tracker.
   virtual URLRequestContext* GetRequestContext() = 0;
 
   // Network client generation methods. All of these four ClientsHandling...
   // methods return an array of CRNForwardingNetworkClient instances, according
   // to the CRNForwardingNetworkClientFactories added to the tracker. The array
   // may be empty. The caller is responsible for taking ownership of the clients
   // in the array.
 
+  // Static method that returns clients that can handle any request, for use
+  // in cases where a request isn't associated with any request_tracker.
+  static NSArray* GlobalClientsHandlingAnyRequest();
+
   // Returns clients that can handle any request.
   NSArray* ClientsHandlingAnyRequest();
   // Returns clients that can handle |request|.
   NSArray* ClientsHandlingRequest(const URLRequest& request);
   // Returns clients that can handle |request| with |response|.
   NSArray* ClientsHandlingRequestAndResponse(const URLRequest& request,
                                              NSURLResponse* response);
   // Returns clients that can handle a redirect of |request| to |new_url| based
   // on |redirect_response|.
   NSArray* ClientsHandlingRedirect(const URLRequest& request,
@@ skipping 53 matching lines @@
   bool initialized_;
   CacheMode cache_mode_;
   base::ThreadChecker thread_checker_;
 
   base::WeakPtrFactory<RequestTracker> weak_ptr_factory_;
 };
 
 }  // namespace net
 
 #endif  // IOS_NET_REQUEST_TRACKER_H_