drawBitmapRect() should not touch the CTM when mask filters are present

Blur sigma calculations are CTM dependent, so we cannot take the
drawBitmap() fast path in the presence of mask filters.

BUG=skia:5682
R=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2286873002

Review-Url: https://codereview.chromium.org/2286873002
2 files changed