Google Now Extension Auto Download

chrome/browser/ui/app_list/app_list_extension.cc

+// Copyright 2015 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/ui/app_list/app_list_extension.h"
+
+#include "components/variations/variations_associated_data.h"
+
+namespace {
+const char kAppListExtensionFieldTrialName[] = "AppListExtension";
+};  // namespace
+
+bool GetAppListExtensionId(std::string* extension_id) {
+  *extension_id =
+      variations::GetVariationParamValue(kAppListExtensionFieldTrialName, "id");
+  return !extension_id->empty();
+}