We were using the first type as the type for each declaration,
which could cause erros for arrays, eg "float one[4], two;"

BUG=angle:431
TEST=WebGL CTS 1.0.2

Change-Id: I104d6701cc019ae3b3831a2d568ffe2b656b45a2
Reviewed-on: https://chromium-review.googlesource.com/179351Reviewed-by: Nicolas Capens <nicolascapens@chromium.org>
Commit-Queue: Nicolas Capens <nicolascapens@chromium.org>
Tested-by: Nicolas Capens <nicolascapens@chromium.org>