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This CL reverts this commit which actually removes building the
unittests. It also adds the unittests to cast_tests.

https://chromium-review.googlesource.com/c/chromium/src/+/1005027

Bug: 73746352
Test: unittests

Change-Id: I341649507f0440a62905f8eccd442215388130dd
Reviewed-on: https://chromium-review.googlesource.com/1007842
Commit-Queue: Mina Almasry <almasrymina@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550674}