Adding a field trial to enable speculative resource prefetching learning.

chrome/browser/predictors/resource_prefetch_predictor.h

 // Copyright (c) 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 CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_H_
 #define CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 88 matching lines @@
 
     // Only for responses.
     std::string mime_type;
     bool was_cached;
   };
 
   ResourcePrefetchPredictor(const Config& config, Profile* profile);
   virtual ~ResourcePrefetchPredictor();
 
   // Thread safe.
-  static bool IsEnabled();
+  static bool IsEnabled(Profile* profile);
   static bool ShouldRecordRequest(net::URLRequest* request,
                                   ResourceType::Type resource_type);
   static bool ShouldRecordResponse(net::URLRequest* response);
   static bool ShouldRecordRedirect(net::URLRequest* response);
 
   static ResourceType::Type GetResourceTypeFromMimeType(
       const std::string& mime_type,
       ResourceType::Type fallback);
 
   void RecordURLRequest(const URLRequestSummary& request);
@@ skipping 88 matching lines @@
 
   NavigationMap inflight_navigations_;
   UrlTableCacheMap url_table_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourcePrefetchPredictor);
 };
 
 }  // namespace predictors
 
 #endif  // CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_H_