Enable two sub-pixel scrolling tests that are now passing. Move one to pre-existing bug dependency.
Enable two sub-pixel scrolling tests that are now passing. Move one to pre-existing bug dependency.

BUG=472817

Review URL: https://codereview.chromium.org/1087663003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@193711 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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