Align static and streaming vertex data to 16-byte boundaries.
Align static and streaming vertex data to 16-byte boundaries.

Certain vertex formats using fewer than 4 bytes could confuse our
buffer code, giving us improperly aligned offsets. Aligning vertex
data across the board should fix the problem, and minimal cost.

Change-Id: I6884b4ddcfb91ef309a970593aaf7932cb65712e
Reviewed-on: https://chromium-review.googlesource.com/185196
Reviewed-by: Shannon Woods <0f3694938fd5703bd548127ee497e4d604509bef@chromium.org>
Tested-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

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