Give correct bounds to SkCanvas's AutoDrawLooper use for filter draws.

In conjuction with https://codereview.chromium.org/137423005/, this allows the canvas to tighten the bounds passed to saveLayer() only the affected region.

R=reed@google.com
BUG=100703

Review URL: https://codereview.chromium.org/141433017

git-svn-id: http://skia.googlecode.com/svn/trunk@13221 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed