Add finch flag for rendering a recently closed link on the local ntp.

chrome/browser/search/search.cc

 // Copyright 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/search/search.h"
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
@@ skipping 44 matching lines @@
 
 const char kInstantExtendedActivationName[] = "instant";
 const InstantExtendedDefault kInstantExtendedActivationDefault =
     INSTANT_DEFAULT_ON;
 
 const char kLocalOnlyFlagName[] = "local_only";
 
 // Key for specifying local NTP behavior trials.
 const char kLocalNTPFlagName[] = "local_ntp";
 
+// Key for enabling the recently closed link on the local NTP.
+const char kRecentlyClosedNTPLinkFlagName[] = "recently_closed_ntp_link";

[samarth, 2013/05/03 04:52:45]

show_recently_closed_ntp_link or just show_recently_closed

[jeremycho, 2013/05/03 06:30:29]

Done.

+
 // Constants for the field trial name and group prefix.
 const char kInstantExtendedFieldTrialName[] = "InstantExtended";
 const char kGroupNumberPrefix[] = "Group";
 
 // If the field trial's group name ends with this string its configuration will
 // be ignored and Instant Extended will not be enabled by default.
 const char kDisablingSuffix[] = "DISABLED";
 
 TemplateURL* GetDefaultSearchProviderTemplateURL(Profile* profile) {
   TemplateURLService* template_url_service =
@@ skipping 411 matching lines @@
   FieldTrialFlags flags;
   if (GetFieldTrialInfo(
           base::FieldTrialList::FindFullName(kInstantExtendedFieldTrialName),
           &flags, NULL)) {
     return GetBoolValueForFlagWithDefault(kLocalNTPFlagName, false, flags);
   }
 
   return false;
 }
 
+bool IsRecentlyClosedNTPLinkEnabled() {
+  FieldTrialFlags flags;
+  if (GetFieldTrialInfo(
+          base::FieldTrialList::FindFullName(kInstantExtendedFieldTrialName),
+          &flags, NULL)) {
+    return GetBoolValueForFlagWithDefault(
+        kRecentlyClosedNTPLinkFlagName, false, flags);
+  }
+
+  return false;
+}
+
 bool MatchesOriginAndPath(const GURL& my_url, const GURL& other_url) {
   return MatchesOrigin(my_url, other_url) && my_url.path() == other_url.path();
 }
 
 void EnableInstantExtendedAPIForTesting() {
   CommandLine* cl = CommandLine::ForCurrentProcess();
   cl->AppendSwitch(switches::kEnableInstantExtendedAPI);
 }
 
 bool GetFieldTrialInfo(const std::string& group_name,
@@ skipping 94 matching lines @@
 
   GURL instant_url = TemplateURLRefToGURL(template_url->instant_url_ref(),
                                           kDisableStartMargin);
   // Extended mode instant requires a search terms replacement key.
   return instant_url.is_valid() &&
          (!IsInstantExtendedAPIEnabled() ||
           template_url->HasSearchTermsReplacementKey(instant_url));
 }
 
 }  // namespace chrome