Roll external/skia d425dee66..9e25bb993 (8 commits)

https://skia.googlesource.com/skia.git/+log/d425dee66..9e25bb993

2019-04-29 mtklein@google.com public_includes -= include/third_party/vulkan
2019-04-29 mtklein@google.com Revert "SKIA_IMPLEMENTATION is only relevant in shared builds"
2019-04-29 benjaminwagner@google.com Check event log for all Windows tasks
2019-04-29 mtklein@google.com remove third_party/skcms from includes
2019-04-29 halcanary@google.com Experimental text editor: factor out Editor class.
2019-04-29 halcanary@google.com sk_app: fix BUILD file
2019-04-29 brianosman@google.com Move skcms.h to include/third_party/skcms
2019-04-29 jvanverth@google.com Cache some more Metal state.

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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
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Test: Presubmit checks will test this change.
Change-Id: I2a2f8733368dff35239cfc718e74d8e0fbf0db56
Exempt-From-Owner-Approval: The autoroll bot does not require owner approval.