blink: Enable overflow for canvas elements.

Enable the code-path to apply overflow, overflow-clip-margin and paint
containment to canvas elements similar to other elements.

R=pdr@chromium.org, vmpstr@chromium.org

Bug: 1321217
Change-Id: Ib616448bd7bd925ee1ae3b269709903d5cc18637
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3715313
Reviewed-by: Vladimir Levin <vmpstr@chromium.org>
Auto-Submit: Khushal Sagar <khushalsagar@chromium.org>
Commit-Queue: Khushal Sagar <khushalsagar@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Reviewed-by: Juanmi Huertas <juanmihd@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1018308}