Bug 1052063 - Reverse the order of transforms applied for layers during composition. r=
Bug 1052063 - Avoid running multiple animation steps if there are multiple layers sharing an APZC. r=
Bug 1052063 - Expand the APZCTreeManagerTester to take care of more boilerplate. r=
Bug 1052063 - Add some tests to ensure layers with the same scrollid get the same APZC. r=
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Revert "Bug 1052063 - Avoid running multiple animation steps if there are multiple layers sharing an APZC. r="

This reverts commit b1da59b80842487d1bbf8e7a529002d6c09f1a90.