Added enhanced bookmarks extension as an external component extension

chrome/browser/extensions/external_component_loader.cc

 // Copyright (c) 2013 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/extensions/external_component_loader.h"
 
+#include "base/command_line.h"
+#include "base/metrics/field_trial.h"
 #include "base/values.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension_constants.h"
+#include "components/variations/variations_associated_data.h"
+#include "extensions/common/features/feature.h"
+#include "extensions/common/features/feature_provider.h"
 
 namespace extensions {
 
 ExternalComponentLoader::ExternalComponentLoader() {}
 
 ExternalComponentLoader::~ExternalComponentLoader() {}
 
 void ExternalComponentLoader::StartLoading() {
   prefs_.reset(new base::DictionaryValue());
   std::string appId = extension_misc::kInAppPaymentsSupportAppId;
   prefs_->SetString(appId + ".external_update_url",
                     extension_urls::GetWebstoreUpdateUrl().spec());
+
+  const char kFieldTrialName[] = "EnhancedBookmarks";
+  const char kFieldTrialDefaultGroupName[] = "Default";
+  std::string field_trial_group_name =
+      base::FieldTrialList::FindFullName(kFieldTrialName);
+  if (!field_trial_group_name.empty() &&
+      field_trial_group_name != kFieldTrialDefaultGroupName &&
+      !CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDisableEnhancedBookmarks)) {
+    appId = chrome_variations::GetVariationParamValue(kFieldTrialName, "id");
+    FeatureProvider* feature_provider =
+        FeatureProvider::GetPermissionFeatures();
+    Feature* feature = feature_provider->GetFeature("metricsPrivate");
+    if (feature && feature->IsIdInWhitelist(appId)) {
+      prefs_->SetString(appId + ".external_update_url",
+                        extension_urls::GetWebstoreUpdateUrl().spec());
+    }
+  }
   LoadFinished();
 }
 
 }  // namespace extensions