Adding a PictureResolution option to SkPictureImageFilter

This change adds an option to SkPictureImageFilter to make it
rasterize SkPicture in a resolution that matches the local coordinate
space (equivalent to the record-time device space).

BUG=skia:3176
R=reed@google.com, senorblanco@chromium.org

Review URL: https://codereview.chromium.org/753073010
6 files changed