[css-typed-om] Update tests for CSSMatrixComponent.

This patch updates tests for CSSMatrixComponent. We also update the
implementation: If a component options is passed in, the component.is2D
attribute uses the options, regardless of whether the matrix is 2D.

Spec: https://drafts.css-houdini.org/css-typed-om-1/#cssmatrixcomponent

Bug: 545318
Change-Id: I880c6eb17282e5d2dd3946da5458aa9db7417be1
Reviewed-on: https://chromium-review.googlesource.com/823802
Commit-Queue: Darren Shen <shend@chromium.org>
Reviewed-by: meade_UTC10 <meade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524644}
2 files changed