This reverts commit 0b36d3e2.

https://skia.googlesource.com/skia.git/%2Blog/6d60534e95d8..76e626d9bb55

git log 6d60534e95d89d86068f0ea0ce00abf241b5b5e1..76e626d9bb555d2a831b1f91b37e93649bfbd71d --date=short --no-merges --format=%ad %ae %s
2019-04-10 halcanary@google.com SkQP: remove bad tests from future branches.

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 (egdaniel@google.com), and stop
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https://skia.googlesource.com/skia.git/%2Blog/4d657d5e894a..6d60534e95d8

git log 4d657d5e894a7f89da68b5c41ae8e31128253e21..6d60534e95d89d86068f0ea0ce00abf241b5b5e1 --date=short --no-merges --format=%ad %ae %s
2019-04-11 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update go_deps asset
2019-04-11 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 f39b4f0280ef..e6b23e45b380 (7 commits)
2019-04-11 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 1b121674f584..f8764798ff0e (366 commits)

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 (egdaniel@google.com), and stop
the roller if necessary.

https://skia.googlesource.com/skia.git/%2Blog/99d792276740..4d657d5e894a

git log 99d792276740293109edb22a26fea50490e7eeaf..4d657d5e894a7f89da68b5c41ae8e31128253e21 --date=short --no-merges --format=%ad %ae %s
2019-04-11 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader f0aa9d5ab738..3954a0bafb8a (42 commits)

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If the roll is causing failures, please contact the current sheriff (egdaniel@google.com), and stop
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https://skia.googlesource.com/skia.git/%2Blog/42280f8961fa..99d792276740

git log 42280f8961fa90f5829b561f7925be3354e5991e..99d792276740293109edb22a26fea50490e7eeaf --date=short --no-merges --format=%ad %ae %s
2019-04-10 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-04-10 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-04-10 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-04-10 reed@google.com oops, remove the rest of SkMixer
2019-04-10 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-04-10 herb@google.com Return a span from getMetrics
2019-04-10 egdaniel@google.com Add more general flush call to GrContext.
2019-04-10 ethannicholas@google.com removed duplicate GrCircleEffect.cpp

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-flutter-autoroll

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Android Embedding PR28: Report app is active to Flutter in FlutterFragment.onResume() instead of onPostResume() forwarded from Activity. (#8536)

Since the GLFW shell is likely to continue to exist in at least the
medium term, it is useful for maintenance to be able to build and use it
on any desktop platform.

Includes a buildroot roll to pick up the macOS build suppport for
third_party/glfw.

https://skia.googlesource.com/skia.git/%2Blog/b5c685991faa..42280f8961fa

git log b5c685991faa79d6ac5caeacd48644eca4954426..42280f8961fa90f5829b561f7925be3354e5991e --date=short --no-merges --format=%ad %ae %s
2019-04-10 brianosman@google.com Add Shared library Windows builds
2019-04-10 brianosman@google.com Even more DLL build fixes
2019-04-10 reed@google.com remove SkMixer, since we have explicit lerps/blends in SkShader
2019-04-10 egdaniel@google.com Reland "Remove unnecessary flush in RenderYUVAToRGBA (take 2)"
2019-04-10 fmalita@chromium.org [skottie] Initial "Levels" effect support
2019-04-10 fmalita@chromium.org Reland "[skottie] More snug kTop Shaper alignment"
2019-04-10 jvanverth@google.com Add mipmap generation for Metal
2019-04-10 halcanary@google.com SkPDF: narrow layer bbox
2019-04-10 egdaniel@google.com Revert "Remove unnecessary flush in RenderYUVAToRGBA (take 2)"
2019-04-10 mtklein@google.com make to_vec template parameters explicit
2019-04-10 mtklein@google.com tweak SkVx to play nicely with others
2019-04-08 herb@google.com Add an index to SkGlyphPos
2019-04-10 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-04-10 brianosman@google.com Make SkShaper's GN setup more DLL friendly
2019-04-10 brianosman@google.com Make Skottie's GN setup more DLL friendly
2019-04-10 ethannicholas@google.com moved files generated from .fp files into generated/ directories
2019-04-08 herb@google.com Reland "Do not use sub-pixel positioning for source space"
2019-04-10 robertphillips@google.com Remove unnecessary flush in RenderYUVAToRGBA (take 2)
2019-04-10 brianosman@google.com Delete SkSL::Compiler copy constructor and assignment operator
2019-04-10 bungeman@google.com Make path in Sk1DPathEffect thread safe.
2019-04-10 halcanary@google.com SkPDF: split GraphicStateStack out
2019-04-10 halcanary@google.com SkPDF: simplify device drawRect
2019-04-10 ethannicholas@google.com regenerated FP files to make bot happy
2019-04-09 bsalomon@google.com Add Vulkan implementation of transfering from GrSurface to a GrGpuBuffer
2019-04-10 brianosman@google.com Define all ImageSetEntry members out of line
2019-04-09 robertphillips@google.com Skip flush in GrDrawingManager if the specifed proxy doesn't have any work (take 2)
2019-04-09 rmistry@google.com [Android compile bot] Also build frameworks/base/libs/hwui
2019-04-09 nifong@google.com externs needed for cpu/gpu switch
2019-04-10 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update go_deps asset
2019-04-10 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 82418c821689..f39b4f0280ef (12 commits)
2019-04-10 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader eba396cc66d3..f0aa9d5ab738 (14 commits)
2019-04-10 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 79154509c679..1b121674f584 (400 commits)

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 (egdaniel@google.com), and stop
the roller if necessary.

This was originally implemented in https://github.com/flutter/engine/commit/d217a951262df45a9e874403267b9d4bb0d9016c
but was not retained when cull rects were removed from the SceneBuilder.

Fixes https://github.com/flutter/flutter/issues/30819

https://skia.googlesource.com/skia.git/%2Blog/10bf7020aa15..b5c685991faa

git log 10bf7020aa154dfbd024df40a33c8f39e5264a47..b5c685991faa79d6ac5caeacd48644eca4954426 --date=short --no-merges --format=%ad %ae %s
2019-04-09 reed@google.com remove shader factory guard define
2019-04-10 egdaniel@google.com Revert "Add non-AA support to OvalFactoryOps."
2019-04-09 kjlubick@google.com Move common canvas/pathkit dockerfiles to more intuitive location

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 (egdaniel@google.com), and stop
the roller if necessary.

When flutter/synchronization was first authored, we did not own fml (it was called fxl then). Now we do, so use a single spot for such utilities. The pipeline was meant to be a general purpose utility that was only ever used by the animator (it even has animator specific tracing), so move that to shell instead (where the animator resides).

The issue with gn --unoptimized seems to be solved in the ToT engine, buildroot, or depot_tools.

The added test makes sure that it won't be broken again for non-Google windows machines.

The number of workers depends on what the platform deem appropriate for the system at runtime.

https://skia.googlesource.com/skia.git/%2Blog/de8362c6f212..10bf7020aa15

git log de8362c6f212b42b03de66a58df29272cb3081be..10bf7020aa154dfbd024df40a33c8f39e5264a47 --date=short --no-merges --format=%ad %ae %s
2019-04-09 jvanverth@google.com Add non-AA support to OvalFactoryOps.
2019-04-09 ethannicholas@google.com ComposeShader GPU implementations
2019-04-09 jvanverth@google.com Add RG format to Metal
2019-04-09 mtklein@google.com extract ToolUtils::colortype_depth()
2019-04-09 bungeman@google.com Build HarfBuzz with multi-thread support.

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-flutter-autoroll

Documentation for the AutoRoller is here:
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If the roll is causing failures, please contact the current sheriff (egdaniel@google.com), and stop
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1490a90bc1 Track guards using NullabilityNode rather than ConstraintVariable.
7f224d9fbe Track parameters that might need to be made optional/required using NullabilityNode.
6c063512ae Validate that nullability is propagated from optional/required named parameters.
ed7f524afb Refactor more of the migration tool to use NullabilityNode rather than ConstraintVariable.
78c55022b1 [VM] - Fix for issue 36484 exposed when ExperimentalFlag.constantUpdate2018 is turned on in CFE
a7175938c3 Remove use of package_root in analyzer/test/error_test
45a5349175 Track constant field initializers for field analysis.
91c042c066 Implement isCovariant for fields.

This used to be when we had two text shaping engines.

https://skia.googlesource.com/skia.git/%2Blog/b5d8c634f95b..de8362c6f212

git log b5d8c634f95b008882710cb27b6094b3f69d1a85..de8362c6f212b42b03de66a58df29272cb3081be --date=short --no-merges --format=%ad %ae %s
2019-04-09 mtklein@google.com remove DMJsonWriter::AddTestFailure
2019-04-09 bsalomon@google.com Temporarily make TransferPixelsFromTest read BGRA as RGBA on ES.
2019-04-09 reed@google.com remove def of colorfilter flag
2019-04-09 reed@google.com New factories for SkShaders
2019-04-09 nifong@google.com full collection of externs
2019-04-08 herb@google.com Reland "Handle translating blob to origin in bulk"
2019-04-09 halcanary@google.com SkPDF: move annotations away from device.
2019-04-09 mtklein@google.com some refactoring ideas
2019-04-09 ethannicholas@google.com SkSL 'key' variables can now be controlled by 'when' expressions
2019-04-09 fmalita@chromium.org Revert "[skottie] More snug kTop Shaper alignment"
2019-04-09 halcanary@google.com SkPDF: remove unused field
2019-04-09 egdaniel@google.com Fix to barrier batching.
2019-04-09 mtklein@google.com --parameters -> --properties
2019-04-09 michaelludwig@google.com Detect simpler quad type when possible

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-flutter-autoroll

Documentation for the AutoRoller is here:
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If the roll is causing failures, please contact the current sheriff (egdaniel@google.com), and stop
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Some components in the Flutter engine were derived from the forked blink codebase. While the forked components have either been removed or rewritten, the use of the blink namespace has mostly (and inconsistently) remained. This renames the blink namesapce to flutter for consistency. There are no functional changes in this patch.

Creating fonts can take a long time (50ms+) during frame build in the UI
thread.  Trace them to help us understand when it's causing a jank.

https://skia.googlesource.com/skia.git/%2Blog/9a7c7be15969..b5d8c634f95b

git log 9a7c7be15969e1e0bad0b7a5c6bb40e254265838..b5d8c634f95b008882710cb27b6094b3f69d1a85 --date=short --no-merges --format=%ad %ae %s
2019-04-08 reed@google.com remove guard for bitmap shader api
2019-04-09 bsalomon@google.com Add support for importing GL_R16F for YUVA promise images
2019-04-04 martin@mainframe.co.uk add missing shared lib visibility macros
2019-04-09 herb@google.com Revert "Handle translating blob to origin in bulk"
2019-04-09 herb@google.com Revert "Reland "Do not use sub-pixel positioning for source space""
2019-04-09 skia-autoroll@skia-public.iam.gserviceaccount.com Roll skia/third_party/skcms 36eeb1311a72..0da672fc2c69 (1 commits)
2019-04-09 herb@google.com Reland "Add maxDimension() to glyph"
2019-04-09 herb@google.com Reland "Do not use sub-pixel positioning for source space"
2019-04-08 brianosman@google.com Shader serialization experiment (with Mali Offline Compiler analysis)
2019-04-09 reed@google.com Revert "Do not use sub-pixel positioning for source space"
2019-04-09 reed@google.com Revert "Add maxDimension() to glyph"

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-flutter-autoroll

Documentation for the AutoRoller is here:
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If the roll is causing failures, please contact the current sheriff (egdaniel@google.com), and stop
the roller if necessary.

* switch to newer APIs for shaders and filters

* fix formatting

https://skia.googlesource.com/skia.git/%2Blog/097e77cd3ba0..9a7c7be15969

git log 097e77cd3ba09f7b81025ecd52d73fa5511e9161..9a7c7be15969e1e0bad0b7a5c6bb40e254265838 --date=short --no-merges --format=%ad %ae %s
2019-04-09 robertphillips@google.com Revert "Skip flush in GrDrawingManager if the specifed proxy doesn't have any work"

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-flutter-autoroll

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https://skia.googlesource.com/skia.git/%2Blog/696e8dda3ca3..097e77cd3ba0

git log 696e8dda3ca30438f440777bd17e69e5ccd748c1..097e77cd3ba09f7b81025ecd52d73fa5511e9161 --date=short --no-merges --format=%ad %ae %s
2019-04-09 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update go_deps asset

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-flutter-autoroll

Documentation for the AutoRoller is here:
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If the roll is causing failures, please contact the current sheriff (egdaniel@google.com), and stop
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https://skia.googlesource.com/skia.git/%2Blog/0ea414a08208..696e8dda3ca3

git log 0ea414a082083f56ea2ab18828192d020b50e69f..696e8dda3ca30438f440777bd17e69e5ccd748c1 --date=short --no-merges --format=%ad %ae %s
2019-04-09 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 4ba1911b2d7f..eba396cc66d3 (3 commits)
2019-04-09 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 90b1865e2a8b..82418c821689 (8 commits)
2019-04-09 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src afd96fdcf75a..79154509c679 (442 commits)

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-flutter-autoroll

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If the roll is causing failures, please contact the current sheriff (egdaniel@google.com), and stop
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When running on Fuchsia, "fml/trace_event.h" sends trace events towards
Fuchsia's tracing system, rather than its own |fml::tracing::*| one.  Do
the same thing for |FlutterEventTracer|, in order to unlock category
"skia" trace events when running on Fuchsia.

The reason this was not working before is because |FlutterEventTracer|
was directly using |fml::tracing::*| functions, rather than the
TRACE_EVENT_* macros.

In the future, we can look into having the skia event tracer enabled by
default on Fuchsia, controlling the presence of Skia events by
enabling/disabling the "skia" category, once we measure the performance
cost of doing so.

https://skia.googlesource.com/skia.git/%2Blog/2f08a4043b26..0ea414a08208

git log 2f08a4043b26370aa24f713f5960433af8dd398f..0ea414a082083f56ea2ab18828192d020b50e69f --date=short --no-merges --format=%ad %ae %s
2019-04-08 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-04-08 fmalita@chromium.org [skottie] More snug kTop Shaper alignment

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-flutter-autoroll

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If the roll is causing failures, please contact the current sheriff (egdaniel@google.com), and stop
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cc63d6e647 dart fix support for control_flow_collection fixes
6d941f8099 Add manifest file error codes to master list of errors
e9765499cc Support for name offset, code offset/length, documentation.
cb894430ae error code associations for ui as code lints
29a6ad3beb Lazy AstBinaryReader is always lazy.
8f3608ca25 Enable ddb to run with experiments
de6a7feb24 [vm] Add assertion to check if number of type arguments was calculated before setting type parameters
86734d476b [infra] Remove obsolete tools/infra/config directory

Looks like someone added a new use of the method while I was waiting for flutter
to roll. nuking the last instance so i can move forward with deprecating and
removing it.

b23817105c Build types for function typed formal parameters.
93b4c5ca57 [vm] Improve error message for Dart_PropagateError with no exit frame.
3dd09e2a3d Follow up on change https://dart-review.googlesource.com/c/sdk/+/98623 to fix a failing Windows test
94c34d3cbe Introduce a getter on the Variables class to represent types that are a priori known to be non-nullable.
3ffe59e1e9 Fix for URIs of parts.
f1f297e213 Build export elements and combinators.
762acf00e8 Restore computing export scopes.
959cf5967d Simplify strong_test_helper