Roll external/skia 4f9647efb..ffdf3ec88 (6 commits)
https://skia.googlesource.com/skia.git/+log/4f9647efb..ffdf3ec88
2018-02-13 skcms-skia-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com Roll skia/third_party/externals/skcms/ 6200c1717..dc2a7f5e3 (2 commits)
2018-02-13 bsalomon@google.com Revert "Allow linear 8888 surface contexts in GPU backend."
2018-02-13 robertphillips@google.com Make fully lazy proxies possess an origin
2018-02-13 bsalomon@google.com Allow linear 8888 surface contexts in GPU backend.
2018-02-13 pirama@google.com Turn off PGO for Skia
2018-02-13 jvanverth@google.com Add scaled emoji GM.
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Test: Verify that affected CTS tests and HwAccelerationTest are fixed.
Change-Id: I66ed22978ed04914afa51882347056102914bb74