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Only reference filters can create visual effect on empty contents.
As we now support empty paint chunks, we can avoid the dummy display
item for a filter on empty contents. Instead, we emit filter paint
operation for the filter with correct bounds and visual rect in
PaintChunksToCcLayer.

Change-Id: I709858a236aefa0403d35f591928f25875560f9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2093915
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748800}