Due to Adreno compilation failure of two arrays in single line declaration.

BUG=angleproject:1428
TEST=GLSLTest_ES3.InitGlobalArrayWithArrayIndexing

Change-Id: I05d7c6b3a0eef8c879edf4d9cf24cdec0a2a403c
Reviewed-on: https://chromium-review.googlesource.com/356217Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>