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Previously, we would defer commit when the child didn't yet have a
LocalSurfaceId. This meant we needed a special case to call
DidResizeOrRepaintAck() early when commit would be deferred.

But now the child has the ability to allocate its own
LocalSurfaceId. As a result, we no longer need to defer commit. And
thus, no longer need to call DidResizeOrRepaintAck() early.

BUG=805073,811944,836009

Change-Id: I4e85e926f217cf0fd2d4b5ed3854f09e7145e5a8
Reviewed-on: https://chromium-review.googlesource.com/1024739Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553276}