tree 6131ec61cbd6ec3506ddb72a01c70d4b47b9e8c3
parent 135d34fcb367527a77e71bc2a90490b80743890c
author Austin Eng <enga@chromium.org> 1715630880 +0000
committer Dawn LUCI CQ <dawn-scoped@luci-project-accounts.iam.gserviceaccount.com> 1715630880 +0000

Break Instance->Backend->PhysicalDevice->Instance refcycle

Simplifies the ref hierarchy to minimize ref cycles to make
Dawn less prone to leaking backend objects.

Previously we had:
 Instance->Backend->PhysicalDevice->Instance
 Adapter->PhysicalDevice->Instance

Now, we have:
 Instance->Backend->PhysicalDevice
 Adapter->PhysicalDevice
 Adapter->Instance

Bug: none
Change-Id: I7882eb3b8580146c0ccc56bcba36eefda060fafc
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/170560
Reviewed-by: Loko Kung <lokokung@google.com>
Commit-Queue: Austin Eng <enga@chromium.org>