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This patch implements CSSNumericValue.equals, which compares if two or
more CSSNumericValues are equal.

Spec: https://drafts.css-houdini.org/css-typed-om-1/#dom-cssnumericvalue-equals

Bug: 776173
Change-Id: I1ea3d16e9e872ad7856e67312e5f2586c9dbb750
Reviewed-on: https://chromium-review.googlesource.com/768167
Commit-Queue: Darren Shen <shend@chromium.org>
Reviewed-by: Renée Wright <rjwright@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516983}