Revert CL 117933003. Re-add resource speculative prefetching code.

chrome/browser/ui/webui/predictors/predictors_handler.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_UI_WEBUI_PREDICTORS_PREDICTORS_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_PREDICTORS_PREDICTORS_HANDLER_H_
 
 #include "base/compiler_specific.h"
+#include "chrome/browser/predictors/resource_prefetch_predictor.h"
 #include "content/public/browser/web_ui_message_handler.h"
 
 namespace base {
 class ListValue;
 }
 
 namespace predictors {
 class AutocompleteActionPredictor;
+class ResourcePrefetchPredictor;
 }
 
 class Profile;
 
 // The handler for Javascript messages for about:predictors.
 class PredictorsHandler : public content::WebUIMessageHandler {
  public:
   explicit PredictorsHandler(Profile* profile);
   virtual ~PredictorsHandler();
 
   // WebUIMessageHandler implementation.
   virtual void RegisterMessages() OVERRIDE;
 
  private:
   // Synchronously fetches the database from AutocompleteActionPredictor and
   // calls into JS with the resulting DictionaryValue.
   void RequestAutocompleteActionPredictorDb(const base::ListValue* args);
 
+  // Fetches stats for the ResourcePrefetchPredictor and returns it as a
+  // DictionaryValue to the JS.
+  void RequestResourcePrefetchPredictorDb(const base::ListValue* args);
+
+  // Helper for RequestResourcePrefetchPredictorDb.
+  void AddPrefetchDataMapToListValue(
+      const predictors::ResourcePrefetchPredictor::PrefetchDataMap& data_map,
+      base::ListValue* db) const;
+
   predictors::AutocompleteActionPredictor* autocomplete_action_predictor_;
+  predictors::ResourcePrefetchPredictor* resource_prefetch_predictor_;
 
   DISALLOW_COPY_AND_ASSIGN(PredictorsHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PREDICTORS_PREDICTORS_HANDLER_H_