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 {
 
+const char kFieldTrialName[] = "EnhancedBookmarks";
+
 ExternalComponentLoader::ExternalComponentLoader() {}
 
 ExternalComponentLoader::~ExternalComponentLoader() {}
 
+// This functione will be removed after experiment goes to all users or go away.

[Yaron, 2013/11/25 23:49:33]

s/functione/function

[yefimt, 2013/11/26 00:14:48]

Done.

+bool ExternalComponentLoader::IsEnhancedBookmarksExperimentEnabled() {
+  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) {
+    return false;
+  }
+  std::string app_id =
+      chrome_variations::GetVariationParamValue(kFieldTrialName, "id");
+  FeatureProvider* feature_provider = FeatureProvider::GetPermissionFeatures();
+  Feature* feature = feature_provider->GetFeature("metricsPrivate");
+  return (feature && feature->IsIdInWhitelist(app_id));

[palmer, 2013/11/26 01:03:38]

Nit: don't need outer parentheses

+}
+
 void ExternalComponentLoader::StartLoading() {
   prefs_.reset(new base::DictionaryValue());
   std::string appId = extension_misc::kInAppPaymentsSupportAppId;
   prefs_->SetString(appId + ".external_update_url",
                     extension_urls::GetWebstoreUpdateUrl().spec());
+
+  if (IsEnhancedBookmarksExperimentEnabled() &&
+      (CommandLine::ForCurrentProcess()->
+          GetSwitchValueASCII(switches::kEnableEnhancedBookmarks) != "0")) {
+    std::string app_id =
+        chrome_variations::GetVariationParamValue(kFieldTrialName, "id");
+    prefs_->SetString(app_id + ".external_update_url",
+                      extension_urls::GetWebstoreUpdateUrl().spec());
+  }
   LoadFinished();
 }
 
 }  // namespace extensions