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This relands the following change:

Enable FlingSchedulerMac

Enable tests that were disabled because of this functionality missing.

Bug: 842325
Change-Id: I6f540460f4e5f81d7ff8dd36e4abf369f0bd4785
Reviewed-on: https://chromium-review.googlesource.com/1149612Reviewed-by: Jonathan Ross <jonross@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577957}

This was identified as a cause of flakiness in Mac webkit_layout_tests. But that
test's flakiness also pre-dated this patch. The test in question has also been
marked to expect fails on Mac. The source of that flakiness will be investigated
separately.

Change-Id: I22364cb8e18507b528c6c0c32f452fcf208caf7e
Reviewed-on: https://chromium-review.googlesource.com/1162716
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581309}