Except registration all calls should be dominated by actual visiation
and/or copying.

Bug: 
Change-Id: Iccc58253d627ecf4b4525de5824f76c048c35150
Reviewed-on: https://chromium-review.googlesource.com/645128Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47742}