Fixes the rendering of a SVG filter (e.g. feFlood) by testing against total
area instead of single dimension.

While fixing this bug, I noticed also layer violations in FilterEffectRenderer
and RenderSVGResourceFilter accessing the maximum size defined in FilterEffect
or replicating the test logic for maximum dimension. This patch also fixes
those issues.

BUG=240184

Review URL: https://codereview.chromium.org/150973004

git-svn-id: svn://svn.chromium.org/blink/trunk@167564 bbb929c8-8fbe-4397-9dbb-9b2b20218538