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When the main thread receives DidCommitAndSwap from the impl thread and
the main thread hasn't commited after resize, DidCommitAndSwap belongs
to the previous commit and should not be used for acking the resize.
In other words, (Resize,DidCommit,DidCommitAndSwap) should ack the
resize but (DidCommit,Resize,DidCommitAndSwap) should not.

Change-Id: Ib55c4acb82a90560e1a75d7327e08321b1bf7f0c
Reviewed-on: https://chromium-review.googlesource.com/883909Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Commit-Queue: Saman Sami <samans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533305}