[M149] [WGC] Fix frame size synchronization

Original change's description:
> [WGC] Fix frame size synchronization
>
> Fixes a scenario where the mapped_texture_ and frame_pool_ sizes of the
> WGC capturer could get out of sync and potentially bypass their
> reconciliation on the following frame.
>
> Fixed: chromium:517727318
> Change-Id: Ie4e951bbdf41491200b7ba1289f85e4c02bc22d1
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/476860
> Commit-Queue: Mark Foltz <mfoltz@chromium.org>
> Auto-Submit: Alexander Cooper <alcooper@chromium.org>
> Reviewed-by: Mark Foltz <mfoltz@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#47898}

(cherry picked from commit b5cf1fa607113788cf894d5b6895c72fba1d9254)

Bug: chromium:520653469,chromium:517727318
Change-Id: Ie4e951bbdf41491200b7ba1289f85e4c02bc22d1
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/479900
Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Chrome Cherry Picker <chrome-cherry-picker@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/7827@{#6}
Cr-Branched-From: d606bc991592fbf4dcbe85e9d05db5e501a5ad42-refs/heads/main@{#47595}