Roll external/skia 6516293c1..974c18323 (12 commits)

https://skia.googlesource.com/skia.git/+log/6516293c1..974c18323

2017-11-03 angle-deps-roller@chromium.org Roll skia/third_party/externals/angle2/ c67323a9d..d255123c6 (1 commit)
2017-11-03 jvanverth@google.com Add ms display to Viewer.
2017-11-03 angle-deps-roller@chromium.org Roll skia/third_party/externals/angle2/ 0741c0f1e..c67323a9d (3 commits)
2017-11-03 djsollen@google.com Disable CCPR on the Android Framework.
2017-11-03 fmalita@chromium.org Enforce gradient color stop monotonicity in ctor
2017-11-03 benjaminwagner@google.com Specify minor MacOS version before upgrade.
2017-11-03 scroggo@google.com Make SkImageGeneratorCG apply encoded origin
2017-11-03 caryclark@skia.org create imagepriv and name params
2017-11-03 fmalita@chromium.org Remove gradient onGetGLSLProcessorKey() overrides
2017-11-03 benjaminwagner@google.com Upgrade angler and fugu to latest OS.
2017-11-03 mtklein@chromium.org add some lowp gradient stages
2017-11-03 mtklein@chromium.org Revert "Include Vulkan in all Android builds on the CQ"

The AutoRoll server is located here: https://android-roll.skia.org

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.
Exempt-From-Owner-Approval: The autoroll bot does not require owner approval.

Bug: 68764873
Change-Id: Ib6275a2c35d4a1e70ff099e64e1f418bba64d8a2
(cherry picked from commit 0b7e5a6de3acda0edc6d6a3d88a533af01de0fcf)
55 files changed