Fix crash when calculated secondary size is 0

If for some reasons, parent of GridView asks to measure with 0 secondary size,
calculated mFixedRowSizeSecondary is zero and the array for maintaining the
secondary size of each row is also null.  Then processRowSizeSecondary()
will crash.

Bug 19930906

Change-Id: Ifa45ee94cda133830a0e78b563df5edeeaff9c3f
4 files changed