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This test verifies composited scrollers have consistent clip rect
regardless of current scroll offset. The four boxes in the test have
different fractional translations. The test body and reference are
identical except for scroll offset.

BUG=736052

Change-Id: I97257b29e5abf579aa028d0c04463f4c427f8a58
Reviewed-on: https://chromium-review.googlesource.com/578741
Commit-Queue: Tien-Ren Chen <trchen@chromium.org>
Reviewed-by: Peter Mayo <petermayo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488500}