Enable virtual-viewport specific tests on Desktop platforms.
Enable virtual-viewport specific tests on Desktop platforms.

These were added before virtual-viewport was enabled on Linux/Mac/Windows.
Now that virtual-viewport is on everywhere, these can start running.

TBR=aelias@chromium.org
BUG=428980

Review URL: https://codereview.chromium.org/970563003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@191110 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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