Adding a field trial to enable speculative resource prefetching learning.

chrome/browser/predictors/resource_prefetch_predictor.cc

 // 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.
 
 #include "chrome/browser/predictors/resource_prefetch_predictor.h"
 
 #include <map>
 #include <set>
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/stl_util.h"
 #include "base/time.h"
 #include "chrome/browser/history/history.h"
 #include "chrome/browser/history/history_notifications.h"
 #include "chrome/browser/history/in_memory_database.h"
 #include "chrome/browser/history/url_database.h"
 #include "chrome/browser/predictors/predictor_database.h"
 #include "chrome/browser/predictors/predictor_database_factory.h"
+#include "chrome/browser/prerender/prerender_field_trial.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/load_from_memory_cache_details.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/notification_types.h"
@@ skipping 76 matching lines @@
       initialization_state_(NOT_INITIALIZED),
       tables_(PredictorDatabaseFactory::GetForProfile(
           profile)->resource_prefetch_tables()) {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 }
 
 ResourcePrefetchPredictor::~ResourcePrefetchPredictor() {
 }
 
 // static
-bool ResourcePrefetchPredictor::IsEnabled() {
-  CommandLine* command_line = CommandLine::ForCurrentProcess();
-  return command_line->HasSwitch(
-      switches::kEnableSpeculativeResourcePrefetching);
+bool ResourcePrefetchPredictor::IsEnabled(Profile* profile) {
+  return prerender::IsSpeculativeResourcePrefetchingLearningEnabled(profile);
 }
 
 void ResourcePrefetchPredictor::LazilyInitialize() {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   DCHECK_EQ(initialization_state_, NOT_INITIALIZED);
   initialization_state_ = INITIALIZING;
 
   // Request the in-memory database from the history to force it to load so it's
   // available as soon as possible.
@@ skipping 632 matching lines @@
                    tables_,
                    urls_to_delete));
 }
 
 void ResourcePrefetchPredictor::SetTablesForTesting(
     scoped_refptr<ResourcePrefetchPredictorTables> tables) {
   tables_ = tables;
 }
 
 }  // namespace predictors