Implement support for constructing a 2x2 matrix from a vector.
Implement support for constructing a 2x2 matrix from a vector.

BUG=380353

Change-Id: Ica0b94104e39f87b4a3439df40221b1f682fd678
Reviewed-on: https://chromium-review.googlesource.com/203293
Tested-by: Nicolas Capens <51edc787c30f24c4904e8ffbb5523c3a9f7a451d@chromium.org>
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Shannon Woods <0f3694938fd5703bd548127ee497e4d604509bef@chromium.org>

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