Add an infrastructure to query history.google.com about other forms of browsing history.

components/browsing_data/history_notice_utils.cc

Index: components/browsing_data/history_notice_utils.cc
diff --git a/components/browsing_data/history_notice_utils.cc b/components/browsing_data/history_notice_utils.cc
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+++ b/components/browsing_data/history_notice_utils.cc
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+// Copyright 2016 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 "components/browsing_data/history_notice_utils.h"
+
+#include "components/browser_sync/browser/profile_sync_service.h"
+#include "components/history/core/browser/web_history_service.h"
+
+namespace browsing_data {
+
+bool ShouldShowNoticeAboutOtherFormsOfBrowsingHistory(
+    const ProfileSyncService* sync_service,
+    const history::WebHistoryService* history_service) {
+  return (sync_service &&
+          sync_service->IsUsingSecondaryPassphrase() &&
+          history_service &&
+          history_service->HasOtherFormsOfBrowsingHistory());
+}
+
+}  // namespace browsing_data