GitLab

When probing for new displays we create new snapshots. We need to make
sure that existing ones will contain the same state as the old ones
otherwise the state between the Browser and GPU process will be out of
sync.

BUG=434115
NOTRY=true

Review URL: https://codereview.chromium.org/845383002

Cr-Commit-Position: refs/heads/master@{#311510}