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Assigns IDs semi-randomly to created scenes and restores the session
from a given session ID into a scene.
This fixes a bug where opening a new window would restore the previous
session from the first window.
However, a permanent solution here would be to actually implement
session restoration that is not based on non-persistent integer
window IDs.

Bug: 1069747
Change-Id: I4a5352d56f4a7d506ff618944b9868c688a5b612
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144274
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Commit-Queue: Mark Cogan <marq@chromium.org>
Auto-Submit: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758205}