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The wpt/css/composite-bgcolor-animation was newly added in this CL:
https://chromium-review.googlesource.com/c/chromium/src/+/2464428,
which is specifically to tests the ongoing work of composite background
color animation.

It turns out that we already have wpt/css/css-backgrounds that has
a lot of tests in it to test painting background color. So this CL
moves the tests under composite-bgcolor-animation to css-backgrounds,
and then make the entire css-backgrounds a virtual test suite. This
will ensure more test coverage.

As a result of creating a new virtual test suite, there are 4 tests
currently failing. IMHO that should not block this CL because this
feature is behind a flag.

Bug: 1148305
Change-Id: I3759d0f431d8bcdb5e73f6aec42462ccdb343101
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533586Reviewed-by: Kevin Ellis <kevers@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826921}