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When a paint chunk having 0,0-0x0 rect is processed inside an effect, an early
return prevents the effect_bounds_stack_.back() update in a
ConversionContext::UpdateEffectBounds call. This results in keeping default
PaintOp::kUnsetRect in SaveLayerOp::bounds instead of 0,0-0x0 rect.

This is probably a reason for a related bug 918240 (see bug thread Comment 4 for
details). Application of this patch fixes the lagging print preview.

R=fmalita@chromium.org, samans@chromium.org

Bug: 918240
Change-Id: I022ae01418e83184421cff7e22566228a2f7c6d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1396958
Commit-Queue: Denis Bessonov <dbessonov@yandex-team.ru>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714293}