Add a field trial to disable deferred committing of cookie changes

chrome/browser/prerender/prerender_field_trial.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_field_trial.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
@@ skipping 57 matching lines @@
 const char kDefaultPrerenderServiceURLPrefix[] =
     "https://clients4.google.com/prerenderservice/?q=";
 const int kMinPrerenderServiceTimeoutMs = 1;
 const int kMaxPrerenderServiceTimeoutMs = 10000;
 const int kDefaultPrerenderServiceTimeoutMs = 1000;
 const char kSkipPrerenderLocalCanadidates[] = "SkipPrerenderLocalCandidates";
 const char kSkipPrerenderServiceCanadidates[] =
     "SkipPrerenderServiceCandidates";
 const char kDisableSessionStorageNamespaceMerging[] =
     "DisableSessionStorageNamespaceMerging";
+const char kPrerenderCookieStore[] = "PrerenderCookieStore";
 
 void SetupPrerenderFieldTrial() {
   const FieldTrial::Probability divisor = 1000;
 
   FieldTrial::Probability control_probability;
   FieldTrial::Probability experiment_multi_prerender_probability;
   FieldTrial::Probability experiment_15min_ttl_probability;
   FieldTrial::Probability experiment_no_use_probability;
 
   chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
@@ skipping 339 matching lines @@
 bool SkipLocalPredictorServiceCandidates() {
   return GetLocalPredictorSpecValue(kSkipPrerenderServiceCanadidates) ==
       kEnabledGroup;
 }
 
 bool ShouldMergeSessionStorageNamespaces() {
   return GetLocalPredictorSpecValue(kDisableSessionStorageNamespaceMerging) !=
       kDisabledGroup;
 }
 
+bool IsPrerenderCookieStoreEnabled() {
+  return GetLocalPredictorSpecValue(kPrerenderCookieStore) != kDisabledGroup &&
+      FieldTrialList::FindFullName(kPrerenderCookieStore) != kDisabledGroup;
+}
+
 }  // namespace prerender