Provide a way to specify in Finch trials to disable prerender local

chrome/browser/prerender/prerender_local_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/prerender/prerender_local_predictor.h"
 
 #include <ctype.h>
 
 #include <algorithm>
 #include <map>
@@ skipping 598 matching lines @@
         "Prerender.LocalPredictorTimeUntilUsed",
         GetCurrentTime() - current_prerender_->actual_start_time,
         base::TimeDelta::FromMilliseconds(10),
         base::TimeDelta::FromMilliseconds(GetMaxLocalPredictionTimeMs()),
         50);
     last_swapped_in_prerender_.reset(current_prerender_.release());
     RecordEvent(EVENT_ADD_VISIT_PRERENDER_IDENTIFIED);
   }
   if (ShouldExcludeTransitionForPrediction(info.transition))
     return;
+  Profile* profile = prerender_manager_->profile();
+  if (!profile ||
+      ShouldDisableLocalPredictorDueToPreferencesAndNetwork(profile)) {
+    return;
+  }
   RecordEvent(EVENT_ADD_VISIT_RELEVANT_TRANSITION);
   base::TimeDelta max_age =
       base::TimeDelta::FromMilliseconds(GetMaxLocalPredictionTimeMs());
   base::TimeDelta min_age =
       base::TimeDelta::FromMilliseconds(kMinLocalPredictionTimeMs);
   std::set<URLID> next_urls_currently_found;
   std::map<URLID, int> next_urls_num_found;
   int num_occurrences_of_current_visit = 0;
   base::Time last_visited;
   scoped_ptr<CandidatePrerenderInfo> lookup_info(
@@ skipping 490 matching lines @@
   Profile* profile = prerender_manager_->profile();
   if (!profile)
     return NULL;
   return HistoryServiceFactory::GetForProfileWithoutCreating(profile);
 }
 
 void PrerenderLocalPredictor::Init() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   RecordEvent(EVENT_INIT_STARTED);
   Profile* profile = prerender_manager_->profile();
-  if (!profile || DisableLocalPredictorBasedOnSyncAndConfiguration(profile)) {
+  if (!profile ||
+      ShouldDisableLocalPredictorBasedOnSyncAndConfiguration(profile)) {
     RecordEvent(EVENT_INIT_FAILED_UNENCRYPTED_SYNC_NOT_ENABLED);
     return;
   }
   HistoryService* history = GetHistoryIfExists();
   if (history) {
     CHECK(!is_visit_database_observer_);
     history->ScheduleDBTask(
         scoped_ptr<history::HistoryDBTask>(
             new GetVisitHistoryTask(this, kMaxVisitHistory)),
         &history_db_tracker_);
@@ skipping 426 matching lines @@
       break;
     case content::SessionStorageNamespace::MERGE_RESULT_MERGEABLE:
       RecordEvent(EVENT_NAMESPACE_MISMATCH_MERGE_RESULT_MERGEABLE);
       break;
     default:
       NOTREACHED();
   }
 }
 
 }  // namespace prerender