[roll] Roll fuchsia [scenic] Push view tree snapshots to Mouse/TouchSystem

A previous "noop" code transformation left Mouse/TouchSystem in an odd
state where they held a *reference to a shared_ptr*.  This change makes
things a bit more clear by pushing view tree snapshots to them.

Also, introduces a couple of nifty helper classes:
- view_tree::SnapshotHolder
- view_tree::SnapshotRef

These ensure that we never access different versions of the view tree
with the same call stack, thus removing a source of very tricky bugs.

Original-Original-Bug: 42155648
Original-Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1606762
Original-Original-Revision: 521104fc68752cb8a1e6028df1de323aa9829dc3
GitOrigin-RevId: 98d82a3e7dc6e228e390130d65f8496f6e069195
Change-Id: I9b29f462d5b02a9fd5552e933ce90f56d8d16e1c
1 file changed
tree: 9638b7849cd24936eafd630f65aa1fe54bd48d55
  1. ctf/
  2. git-hooks/
  3. infra/
  4. third_party/
  5. cobalt
  6. flower
  7. jiri.lock
  8. MILESTONE
  9. minimal
  10. prebuilts
  11. README.md
  12. stem
  13. test_durations
README.md

Integration

This repository contains Fuchsia's Global Integration manifest files.

Making changes

All changes should be made to the internal version of this repository. Our infrastructure automatically updates this version when the internal one changes.

Currently all changes must be made by a Google employee. Non-Google employees wishing to make a change can ask for assistance in one of the communication channels documented at get involved.

Obtaining the source

First install Jiri.

Next run:

$ jiri init
$ jiri import minimal https://fuchsia.googlesource.com/integration
$ jiri update

Third party

Third party projects should have their own subdirectory in ./third_party.