Bring up minimal sync and sync unittest targets on iOS.

sync/util/get_session_name_ios.h

Index: sync/util/get_session_name_ios.h
diff --git a/sync/util/get_session_name_ios.h b/sync/util/get_session_name_ios.h
new file mode 100644
index 0000000000000000000000000000000000000000..15e7e98ee73d416a4126e85c5c36a10abc85d2c1
--- /dev/null
+++ b/sync/util/get_session_name_ios.h
@@ -0,0 +1,18 @@
+// 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.
+
+#ifndef SYNC_UTIL_GET_SESSION_NAME_IOS_H_
+#define SYNC_UTIL_GET_SESSION_NAME_IOS_H_
+
+#include <string>
+
+namespace syncer {
+namespace internal {
+
+std::string GetComputerName();
+
+}  // namespace internal
+}  // namespace syncer
+
+#endif  // SYNC_UTIL_GET_SESSION_NAME_IOS_H_