Roll src/third_party/skia 25bc174..7254281 (14 commits) (#8040)

https://skia.googlesource.com/skia.git/%2Blog/25bc174cf682..72542816cadb

git log 25bc174..7254281 --date=short --no-merges --format=%ad %ae %s
2019-03-04 reed@google.com add sample for retained vertices
2019-03-05 fmalita@chromium.org Reland "SkMixerColorFilter GPU impl"
2019-03-05 reed@google.com Revert "SkMixerColorFilter GPU impl"
2019-03-05 reed@google.com Reland "check if we can use legacy blits"
2019-03-05 reed@google.com Revert "check if we can use legacy blits"
2019-02-27 brianosman@google.com Remove dithering during SkConvertPixels
2019-03-05 bsalomon@google.com Remove legacy promise image APIs
2019-03-04 jvanverth@google.com Fix issue with offsetting polygon by 0 distance.
2019-03-05 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader d69cdab..e95eeb1 (1 commits)
2019-03-04 bsalomon@google.com Default implementation of onSetRelease() on GrSurface
2019-03-04 bsalomon@google.com Simplify promise image lazy instantiation callbacks.
2019-03-04 robertphillips@google.com Lay some groundwork for depowering SkGpuDevice's and SkImage_GpuBase's context pointer
2019-03-05 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader d318dd3..d69cdab (4 commits)
2019-03-01 reed@google.com check if we can use legacy blits

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-flutter-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 (reed@google.com), and stop
the roller if necessary.

DEPS

@@ -23,7 +23,7 @@ vars = {
   'fuchsia_git': 'https://fuchsia.googlesource.com',
   'github_git': 'https://github.com',
   'skia_git': 'https://skia.googlesource.com',
-  'skia_revision': '25bc174cf682e666d5437e5f3b910a7a11b4bb9e',
+  'skia_revision': '72542816cadbc3d18a19725f6f6aecf45ffc188c',
 
   # 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

@@ -1,4 +1,4 @@
-Signature: c8fbe627d3b7f9e585d53f4e8584f18b
+Signature: cf0991f5443f916cde12c3bc27ba049f
 
 UNUSED LICENSES:
 
@@ -1717,8 +1717,6 @@ FILE: ../../../third_party/skia/src/effects/SkTrimPE.h
 FILE: ../../../third_party/skia/src/effects/SkTrimPathEffect.cpp
 FILE: ../../../third_party/skia/src/gpu/GrContextThreadSafeProxyPriv.h
 FILE: ../../../third_party/skia/src/gpu/GrDDLContext.cpp
-FILE: ../../../third_party/skia/src/gpu/GrDeinstantiateProxyTracker.cpp
-FILE: ../../../third_party/skia/src/gpu/GrDeinstantiateProxyTracker.h
 FILE: ../../../third_party/skia/src/gpu/GrDriverBugWorkarounds.cpp
 FILE: ../../../third_party/skia/src/gpu/GrFPArgs.h
 FILE: ../../../third_party/skia/src/gpu/GrLegacyDirectContext.cpp