Roll external/skia 347034865..7fde8e172 (5 commits)

https://skia.googlesource.com/skia.git/+log/347034865..7fde8e172

2019-05-02 bungeman@google.com IWYU for gms.
2019-05-02 jvanverth@google.com Fix compositor GMs on Intel Metal
2019-05-02 reed@google.com remove deprecated postTranslate255
2019-05-02 robertphillips@google.com Change opList-splitting reduction default to be off
2019-05-02 halcanary@google.com SkPDF: fix repeat tilemode with alpha

The AutoRoll server is located here: https://autoroll-internal.skia.org/r/android-master-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

Test: Presubmit checks will test this change.
Change-Id: I56e3f4f9d8504b23afc7490861ef216e62314687
Exempt-From-Owner-Approval: The autoroll bot does not require owner approval.