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After resize once commit happens eventually a CompositorFrame will be
submitted with the right size, so just ack the resize after commit
instead of draw.

Change-Id: I9ab712dc325ad77cd704123d93d94ba74eaf63d2
Reviewed-on: https://chromium-review.googlesource.com/984598Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Saman Sami <samans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546716}