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Previously it used RecordSource and RasterSource which did some extra
work not needed and caused DCHECK failure in CompositeAfterPaint when one
DisplayItemList was handled by RecordSource and RasterSource more than
once. In CompositeAfterPaint,
ContentLayerClient::PaintContentsToDisplayList() just returns the cached
DisplayItemList.

Simplify cc::PictureLayer::GetPicture() by directly calling
DisplayItemList::Raster().

Change-Id: I17cbf004371861ef901c95d21011f1bc9b07f880
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2142695Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758342}