Add a SkWStream-based SkSVGCanvas factory

BUG=skia:7047

Change-Id: I729ec3bf7cb1bbdcef1e527ac63dbc1b1857bfa1
Reviewed-on: https://skia-review.googlesource.com/48520
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Mike Reed <reed@google.com>
2 files changed