Roll external/skia e7e1d9d03..9b848d574 (6 commits)

https://skia.googlesource.com/skia.git/+log/e7e1d9d03..9b848d574

2017-05-02 msarett@google.com Add support for row-by-row jpeg encoding
2017-05-02 egdaniel@google.com Fix VkWrapTest
2017-05-02 scroggo@google.com Blacklist memory intensive images on a bot
2017-05-02 fmalita@chromium.org Revert "Remove SkLights include from SkCanvas.h"
2017-05-02 fmalita@chromium.org Reland "Add a clip mask bench"
2017-05-02 fmalita@chromium.org Remove SkLights include from SkCanvas.h

Test: Presubmit checks will test this change.
Change-Id: If3a5bd0df703b04aaade4dde7f9adbfee0f23700