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DeprecatedPaintLayer::transparencyClipBox and
DeprecatedPaintLayer::paintingExtent used to take a sub-pixel accumulation
value as an argument, but that value was inconsistent and often incorrect.
DeprecatedPaintLayer's have a sub-pixel accumulation value as a member for
this purpose, so this patch makes these methods use it. This fixes some
cases where partially transparent nested objects would be clipped
incorrectly at certain sub-pixel offsets.

BUG=476139

Review URL: https://codereview.chromium.org/1304503002

git-svn-id: svn://svn.chromium.org/blink/trunk@200922 bbb929c8-8fbe-4397-9dbb-9b2b20218538