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This reduces size of cc::Layer from 680 to 552 on LP64 systems.

- Adjust order of fields to reduce gaps;
- Remove snap_container_data.

Change-Id: Id2fa92d5feae2cb819b25c400c8ed678a01558ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1798987
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695839}