[Runtime] Add the initialization for the struct members.
[Runtime] Add the initialization for the struct members.

This patch is to add the initialization for the members in FieldIds.

CID=220063

Related to XWALK-2928.

(cherry picked from commit 5822a3b071412bb9ecbe3b297734af3f054a3d2a)

TheDirtyCalvinist/spacewalk,TheDirtyCalvinist/spacewalk,TheDirtyCalvinist/spacewalk,TheDirtyCalvinist/spacewalk,TheDirtyCalvinist/spacewalk,TheDirtyCalvinist/spacewalk