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SaveLayer() can optionally apply a clip. In that case we need to make
sure that we're saving the current clip, to avoid tainting it.

This was discovered while experimenting with SaveFlags removal and
requires a minor test rebaseline.

R=schenney@chormium.org,senorblanco@chromium.org

Review URL: https://codereview.chromium.org/212993004

git-svn-id: svn://svn.chromium.org/blink/trunk@170096 bbb929c8-8fbe-4397-9dbb-9b2b20218538