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Rather than having code to compute the reference box for the various
clients that use FilterEffectBuilder in the class itself, let clients
compute the desired reference box themselves and pass it along.
This separates concerns, and makes code for computing the reference box
less defensive. It also eliminates the need to add even more cases in
the future (like for SVG shorthand support.)

Also push calls to resolveReferenceFilters() in PaintLayer closer to the
filter-building calls, and rename computeFilterOperations to
addReflectionToFilterOperations. This allows us to eliminate a redundant
call to resolveReferenceFilters() in the mapRectForFilter() code-path.

BUG=439970
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2343173002
Cr-Commit-Position: refs/heads/master@{#419290}