Trigger a surface resize to deal with window resize race condition

[k9]

Connections
#9515

Description
Address race condition where hello triangle on webgpu can sometimes draw a fully-red screen since:

• the surface size is 0x0 when async initialization occurs
• winit's Resized event with the real window size may be ignored since it can be fired before the async initialization's Initialized event has been processed.

Testing
Explain how this change is tested.

Squash or Rebase?
Squash

Checklist

• I self-reviewed and fully understand this PR.
• WebGPU implementations built with wgpu may be affected behaviorally.
• Validation and feature gates are in place to confine behavioral changes.
• Tests demonstrate the validation and altered logic works.
• CHANGELOG.md entries for the user-facing effects of this change are present.
• The PR is minimal, and doesn't make sense to land as multiple PRs.
• Commits are logically scoped and individually reviewable.
• The PR description has enough context to understand the motivation and solution implemented.

[inner-daemons]

LGTM