Roll src/third_party/skia 66d8006c2bb1..4fe30e15c06c (11 commits) (#12202)

https://skia.googlesource.com/skia.git/+log/66d8006c2bb1..4fe30e15c06c

git log 66d8006c2bb1..4fe30e15c06c --date=short --no-merges --format='%ad %ae %s'
2019-09-10 bsalomon@google.com Also skip blurrect_compare on DDL configs
2019-09-10 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-09-10 bsalomon@google.com Reland "Separate texture creation from uploading in GrGpu subclasses."
2019-09-10 senorblanco@chromium.org Dawn: implement Sampler cache (optimization).
2019-09-10 jvanverth@google.com Wrap MTLEvent code in availability attributes.
2019-09-10 bsalomon@google.com Revert "Separate texture creation from uploading in GrGpu subclasses."
2019-09-10 senorblanco@chromium.org Dawn: implement staging buffer manager.
2019-09-10 senorblanco@chromium.org Update Dawn backend to accommodate recent Skia API changes.
2019-09-10 bsalomon@google.com Update new blurrect_compare GM to skip when SkCanvas::makeSurface will fail
2019-09-10 bsalomon@google.com Remove unused GM deferred canvas feature
2019-09-10 bsalomon@google.com Separate texture creation from uploading in GrGpu subclasses.

Created with:
  gclient setdep -r src/third_party/skia@4fe30e15c06c

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC mtklein@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

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

Bug: None
TBR=mtklein@google.com

DEPS

@@ -26,7 +26,7 @@ vars = {
   'skia_git': 'https://skia.googlesource.com',
   # OCMock is for testing only so there is no google clone
   'ocmock_git': 'https://github.com/erikdoe/ocmock.git',
-  'skia_revision': '66d8006c2bb1f980beaa302b47cb23d0d60ea81d',
+  'skia_revision': '4fe30e15c06c991c3c0c651ef9974fc402e611e0',
 
   # When updating the Dart revision, ensure that all entries that are
   # dependencies of Dart are also updated to match the entries in the

ci/licenses_golden/licenses_skia

-Signature: 74f59f4bf247930a9c4e3b04db74b92f
+Signature: 80603eb2a40e5b92814ca8c780c1def0
 
 UNUSED LICENSES:
 
@@ -3364,6 +3364,8 @@ FILE: ../../../third_party/skia/src/gpu/dawn/GrDawnRenderTarget.cpp
 FILE: ../../../third_party/skia/src/gpu/dawn/GrDawnRenderTarget.h
 FILE: ../../../third_party/skia/src/gpu/dawn/GrDawnRingBuffer.cpp
 FILE: ../../../third_party/skia/src/gpu/dawn/GrDawnRingBuffer.h
+FILE: ../../../third_party/skia/src/gpu/dawn/GrDawnStagingManager.cpp
+FILE: ../../../third_party/skia/src/gpu/dawn/GrDawnStagingManager.h
 FILE: ../../../third_party/skia/src/gpu/dawn/GrDawnStencilAttachment.cpp
 FILE: ../../../third_party/skia/src/gpu/dawn/GrDawnStencilAttachment.h
 FILE: ../../../third_party/skia/src/gpu/dawn/GrDawnTexture.cpp