Roll external/skia 1333fc5af..69083b2b6 (14 commits)

https://skia.googlesource.com/skia.git/+log/1333fc5af..69083b2b6

2018-10-19 brianosman@google.com Ensure that we allocate 32-bit pixels in GM's generator
2018-10-19 mtklein@google.com Revert "re-enable effect deserialization for flutter"
2018-10-19 mtklein@google.com override getTypeName() instead of using table
2018-10-19 brianosman@google.com Un-plumb dstColorSpace through GrTextureProducer
2018-10-19 egdaniel@google.com Reland "Revert "Use OpenGL sampler objects when available.""
2018-10-19 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader a9999ce938be..9e4d040cb93c (1 commits)
2018-10-19 brianosman@google.com Remove unused dstColorSpace from getROPixels
2018-10-19 michaelludwig@google.com Consolidate aa resolution for per-edge aa quads
2018-10-19 halcanary@google.com SkTArray: behave a little more like std::vector
2018-10-19 brianosman@google.com When checking color type in image shaders, trust SkBitmapProvider, not image
2018-10-19 halcanary@google.com SkBitSet: cleanup. Remove unused fn, more general exporter.
2018-10-19 michaelludwig@google.com Add quad type and persp/aa utilities to GrQuad
2018-10-19 mtklein@google.com clean up flattenable macro cruft
2018-10-19 brianosman@google.com Remove unused SkBitmapProvider functions

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: I286b772d98c9ae0a6dd468ad65a39d9f6b968588
Exempt-From-Owner-Approval: The autoroll bot does not require owner approval.