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

chrome/browser/ui/webui/predictors/predictors_handler.h

Index: chrome/browser/ui/webui/predictors/predictors_handler.h
diff --git a/chrome/browser/ui/webui/predictors/predictors_handler.h b/chrome/browser/ui/webui/predictors/predictors_handler.h
index 1c2c4229c5031c96405c0706f87640a8c465e5b1..f3355e41a67b36de21102eaaefdb96927fbda54a 100644
--- a/chrome/browser/ui/webui/predictors/predictors_handler.h
+++ b/chrome/browser/ui/webui/predictors/predictors_handler.h
@@ -6,6 +6,7 @@
 #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 {
@@ -14,6 +15,7 @@ class ListValue;
 
 namespace predictors {
 class AutocompleteActionPredictor;
+class ResourcePrefetchPredictor;
 }
 
 class Profile;
@@ -32,7 +34,17 @@ class PredictorsHandler : public content::WebUIMessageHandler {
   // 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);
 };