Offload rendering to a worker #20053
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Move the work of drawing the PDF onto the cavas to a worker thread using OffscreenCanvas. This should free up the main thread a bit by moving all of the CanvasGraphics operations to this "renderer" worker.
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This change works on top of #20016 to move
CanvasGraphicsoperations to a new/different worker thread, thus offloading the heavy page renders and freeing up the main thread.