Aliaksandr Kalenik 8a31ecdf39 LibWeb: Use ExternalContentSource for video painting ...

Publish new video frames to an ExternalContentSource, and switch
VideoPaintable from draw_scaled_immutable_bitmap to
draw_external_content.

Because DrawExternalContent reads the latest bitmap at replay time,
frame-only updates (no timeline or control change) now call
set_needs_display(InvalidateDisplayList::No) — skipping display list
rebuilds entirely. This addresses problem 2 from the previous commit.

2026-02-20 18:41:33 +01:00

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