This replaces the special display item and fairly complicated source
graphic recording for 'filter' on a SVG element with using an effect
node like for other 'filter' handling.
This means that SVGFilterRecordingContext and related code can be
removed and the code vastly simplified. It also lays a large piece of
the foundation for handling the full 'filter' specification on SVG
elements.
PaintChunksToCcLayer's logic for handling 'empty' paint chunks is
improved to be able to handle cases where a filter expands the bounds
of an element.

This changes the clipping behavior and how the source graphic is
rendered which causes slight (non-discernible) changes to some tests.
It also affects the visual rect since it now uses the visual rect of
the painted content and not the paint rect that was computed from the
filter. The visual rect of the painted content will have been
conservatively extended to the filter region. It's expected that this
will improve in future CLs when the filter region is not included in the
visual rect.

Bug: 109224, 441297, 1128962
Change-Id: Ie0ad3b65aecba0c2bde06de7e3c8c4066e63c928
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2187795Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#809252}