SCN-947 #comment
SCN-1291 #comment

* Refactor to move Task Queue to its own class

- This is to help with sharing task queue among
  multiple message loops going forward.

- currently there is 1:1 mapping between task queue
  and message loop, we are still maintaining the semantics
  for this change.

* Add mutex include

* Add unit tests for task queue

* fix formatting

* license

According to https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#expectations-around-potential-crashes-in-the-engine

This should address https://github.com/flutter/flutter/issues/31650#issuecomment-494935507

We'll instead use `FML_LOG(ERROR)` to report errors to our CI tests. See https://github.com/flutter/flutter/issues/34194

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/%2Blog/187e8f31236f..084fa1b52f30

git log 187e8f31236fa60475fbf91048bc78019ea4b483..084fa1b52f30c1b1e349b809deda5f240b90b039 --date=short --no-merges --format=%ad %ae %s
2019-06-12 fmalita@chromium.org [skottie] Use metrics for Shaper vertical alignment

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2019-06-13 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 2589cdcc88ec..85fef1bc62f8 (6 commits)

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git log b9416caa367a770e55935916e135572c2461ca37..47c7e80e95524335fdad8034fe71a6352afcd9ae --date=short --no-merges --format=%ad %ae %s
2019-06-13 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 5dc4d131fb35..f6ed31446fb7 (418 commits)
2019-06-13 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader b8260a8e915d..df84b9466cfd (8 commits)

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When running in AOT modes create a flutter_assets directory that can be used as the bundle path (#9306)

The engine RunBundleAndSnapshotFromLibrary API expects a bundle path directory
containing the application's assets.  If the Android embedding is using
AOT ELF library packaging and does not need to extract assets, then create an
empty directory at the bundle path.

Fixes https://github.com/flutter/flutter/issues/34287

The Fuchsia SDK includes a root directory with multiple
license/copyright files. For files that don't include a copyright header
matching them to a specific license (e.g. shared library binaries) we
match them to all licenses.

Specifically, the SDK includes:
* LICENSE: the Fuchsia license
* LICENSE.vulkan: Apache 2.0 license for Vulkan
* COPYRIGHT.vulkan: additional non-Apache licenses/copyrights for Vulkan
* COPYRIGHT.musl: musl license/copyrights

Also rolls the Fuchsia SDK CIPD packages.

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git log 81756e4cae9547a525d039128a870e336f13114b..b9416caa367a770e55935916e135572c2461ca37 --date=short --no-merges --format=%ad %ae %s
2019-06-12 brianosman@google.com SkSL: Fix parsing of array types
2019-06-12 mtklein@google.com tighten up loop test
2019-06-12 egdaniel@google.com Fix setting of pipeline barrier in creating backend VkImage.
2019-06-12 robertphillips@google.com Add Ganesh support for RGBA_16161616 and RG_half
2019-06-12 rmistry@google.com Add tip on patching to G3 bot
2019-06-12 mtklein@google.com expand unit tests, fix extract

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Currently, all our host unit-tests that have rendering concerns use the software backend because of OpenGL ES availability and stability issues on the various platforms where we run host tests. Unfortunately, entire subsystems are disabled (and not tested) when rendering with the software backend. This patch pulls in SwiftShader and via pending patches in the buildroot, configures the host unit-tests to optionally use OpenGL ES in a stable manner without relying on the OpenGL drivers being present (and functional).

I have wired up the embedder test fixture in this patch to use the SwiftShader based OpenGL ES driver. I will update the shell and runtime unittests in a subsequent patch as well. The on and offscreen surfaces are configured as 1x1 pbuffer surface because we should be able to write pixel tests using OpenGL directly wihout having to deal with surfaces.

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git log d62d406aa24c40e210bdc0dd79d434e98034e365..81756e4cae9547a525d039128a870e336f13114b --date=short --no-merges --format=%ad %ae %s
2019-06-12 mtklein@google.com test and fix that we cover the right inputs
2019-06-12 mtklein@google.com eliminate the need for a tmp ymm register
2019-06-12 brianosman@google.com Remove version string from Viewer's "highlight" SkSL shader
2019-06-12 mtklein@google.com remove moot comment
2019-06-07 nifong@google.com Minor optimization to serialization of SkPictures with many subpictures.

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* Revert "[fuchsia] Fix alignment of Fuchsia/non-Fuchsia tracing (#9289)"

This reverts commit f80ac5f5.

* Revert "Align fuchsia and non-fuchsia tracing (#9199)"

This reverts commit 78265484.

* Update Dart to git hash 3166bbf24b0c929eef33fd5d0f69e0f36a9009f3
which is the Dart revision 2.3.3-dev-0.0

* Fix license file.

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git log 698fa78b3cae067ed27ae95f0e90e8493e7cc2f9..d62d406aa24c40e210bdc0dd79d434e98034e365 --date=short --no-merges --format=%ad %ae %s
2019-06-12 reed@google.com Revert "Revert "try resolver pattern""

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2019-06-12 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 1b5ad312c57a..2589cdcc88ec (5 commits)

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2019-06-12 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 3032e0d81bfa..5dc4d131fb35 (409 commits)
2019-06-12 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 0a9f0179ddef..b8260a8e915d (9 commits)

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git log f39124b0764d98afa45495281ea089acc02a5855..d82ca0bf2c9916dbc26f8d8de5198bf6109fd0b4 --date=short --no-merges --format=%ad %ae %s
2019-06-11 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-06-11 egdaniel@google.com A few fixes to recent gpu Copy Op changes.
2019-06-11 bsalomon@google.com Allow async read back GM to YUV to fail. Skip on DDL.

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* Refactor Delayed Tasks to their own class

* fix some comments

* Update BUILD.gn

This should satisfy the low-latency need of DevTools.

Test added:
* ReportTimingsIsCalledSoonerInNonReleaseMode
* ReportTimingsIsCalledLaterInReleaseMode

In some cases, the window needs to be redrawn without a resize. This
adds a callback for that case to trigger a repaint.

Since there's no embedding API for repainting, trigger it with a window
metrics event using the current window size.

Fixes https://github.com/flutter/flutter/issues/30731

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/%2Blog/df586b7d568d..f39124b0764d

git log df586b7d568dadbab54d21f5e66b055911e68eb3..f39124b0764d98afa45495281ea089acc02a5855 --date=short --no-merges --format=%ad %ae %s
2019-06-11 jlavrova@google.com Baseline for empty text
2019-06-11 reed@google.com expose xform to google3
2019-06-11 mtklein@google.com refine perf dumps a little
2019-06-11 bsalomon@google.com Add SkRasterPipeline support for more load/store formats and GrSwizzle.
2019-06-11 herb@google.com Make fAdvance{X|Y} private.
2019-06-11 mtklein@google.com better perf support for JIT code
2019-06-11 nihohit@gmail.com third-party.gni: Search includes using -I.
2019-06-11 rmistry@google.com Increase timeout for G3 framework bot
2019-06-06 mtklein@google.com add basic JIT using xbyak
2019-06-11 herb@google.com Make fForceBW private.
2019-06-11 jvanverth@google.com Fix ASAN issue with CreateTestingOnlyMtlTextureInfo

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dart-lang/sdk@b37aa3b036 Update dart_style to 1.2.8.
dart-lang/sdk@3d96805597 Merge CHANGELOG following 2.3.2-dev.0.1 release
dart-lang/sdk@801ad8b521 [cfe] Remember if finalizeExports was done
dart-lang/sdk@a1401e3015 [vm] Roll back part of 2nd simarm_x64 CL that slowed benchmarks

Fixes a divide-by-zero in pixel density computation.

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/%2Blog/a716809d5ad3..df586b7d568d

git log a716809d5ad3d7eedc368230a2a9a5df88a2df03..df586b7d568dadbab54d21f5e66b055911e68eb3 --date=short --no-merges --format=%ad %ae %s
2019-06-11 bsalomon@google.com Use float literal with std::fill of floats
2019-06-11 jvanverth@google.com Don't use MSAA config if can't resolve
2019-05-30 jlavrova@google.com Reland "SkParagraph"
2019-06-11 brianosman@google.com Remove all NexusPlayer bots and driver workarounds
2019-06-11 rmistry@google.com Add bin/try-clients to trigger client tryjobs
2019-06-11 ethannicholas@google.com fixed an skslc crash with uninitialized globals
2019-06-10 ethannicholas@google.com fixed SkSL handling of negated literal vectors
2019-06-11 jvanverth@google.com Support more YUV texture formats for Metal
2019-06-11 bsalomon@google.com Initial implementation of SkSurface::asyncRescaleAndReadPixelsYUV420.
2019-06-11 herb@google.com Revert "try resolver pattern"
2019-06-11 robertphillips@google.com Remove IO refs from GrSurfaceProxy only
2019-06-05 brianosman@google.com Enable gl_FragCoord workaround on NexusPlayer, and re-enable analytic clipping
2019-06-11 hcm@google.com fix up relative links and spacing
2019-06-10 jvanverth@google.com Minor cleanups to GrMtlGpuRTCommandBuffer
2019-06-10 fmalita@chromium.org [skottie] Animated text tracking support
2019-06-10 jvanverth@google.com Use new retain() method to set up window context.
2019-06-10 ethannicholas@google.com fixed a spot where skslc would crash instead of report a parse error

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A recent Dart roll improved the detection of missing return statements.
Since we enforce that all enum values must be covered in switch
statements, this isn't an issue, but we add a return to fix the lint.

Previously AOT compiled Dart code would be packaged as a group of assets
within the APK.  This has been replaced by a single ELF library containing
the same data.

Adds back constructor for Rasterizer temporarily

dart-lang/sdk@7ecd81b0b8 Start on parser
dart-lang/sdk@5167ec93fc [vm] Remove Class::NumOwnTypeArguments()
dart-lang/sdk@aa246f6588 Add return types on all main declarations
dart-lang/sdk@ded6933b08 New Rti SSA nodes
dart-lang/sdk@0960f72517 Fixes in modular test runner:  - ensure output directory has a trailing slash  - ensure tests complete before returning from runner  - flush log files (probably not necessary)

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git log bba5aa761cd5064f6ce4f2de4e7b0c647b4c4113..a716809d5ad3d7eedc368230a2a9a5df88a2df03 --date=short --no-merges --format=%ad %ae %s
2019-06-10 reed@google.com try resolver pattern

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git log 77cb2ca3c9aa08dc5cd72b67969c06e960121d52..bba5aa761cd5064f6ce4f2de4e7b0c647b4c4113 --date=short --no-merges --format=%ad %ae %s
2019-06-11 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 2d0a9acb0551..1b5ad312c57a (3 commits)
2019-06-11 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 37e3060c53b6..3032e0d81bfa (346 commits)
2019-06-11 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader f60a2d59c9f2..0a9f0179ddef (9 commits)

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git log bb74990a11d91ebe0ff474107c6dae3c0aadf308..77cb2ca3c9aa08dc5cd72b67969c06e960121d52 --date=short --no-merges --format=%ad %ae %s
2019-06-10 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).

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dart-lang/sdk@97f91fecdb [vm] Mark Profiler_StringInterpolation Fail in vm.status
dart-lang/sdk@c167374232 Add Never*, use it in type provider etc
dart-lang/sdk@97dc7f4482 Support constructor declarations (issue 37196)
dart-lang/sdk@ed9d185a9e Top-level getters do not have parameters
dart-lang/sdk@5ca5a53f64 Migration: Add support for generic function types.
dart-lang/sdk@c2696591a6 Migration: Add more support for dynamic, clean up handling of void.
dart-lang/sdk@8b17b2e143 Migration: add support for null-aware accesses.
dart-lang/sdk@2b76cdf1d7 [ VM ] Remove bad status file entries for data_uri_import_test/utf16
dart-lang/sdk@881a2e9e48 Migration: remove unnecessary constructor argument
dart-lang/sdk@eba533dcd1 Migration: Clean up handling of LUB and substitution nodes.
dart-lang/sdk@c41e9ae0e8 Fix wording in spec
dart-lang/sdk@0a0927de9c Migration: Separate the implementation from the NNBD migration engine's public API.
dart-lang/sdk@b3b9aacc5f [dartdevc] enable testing on ff/safari/edge
dart-lang/sdk@575a6424c3 Migration: Remove transitional API
dart-lang/sdk@e23b00745f Migration: Move classes out of transitional_api.dart
dart-lang/sdk@47865b7643 Migration: remove unused field Variables._graph.
dart-lang/sdk@4270982dd1 TypeSystem tests code motion.
dart-lang/sdk@0629ce94cc Change location where we set AnalysisDriver.useSummary2 in build mode.
dart-lang/sdk@f94628fb1b Convert the remaining diagnostics tests to test for location
dart-lang/sdk@e4196ce8c6 [vm] Namespace constants like offsets and sizeofs to use runtime_api.h
dart-lang/sdk@51046368c5 Move NNBD migration tool to a fresh package.
dart-lang/sdk@6c358d3ba6 Permissive mode reports the exceptions that were thrown and ignored

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git log cb1adb40d0f310c6edac6c4afbede5acd0388b59..bb74990a11d91ebe0ff474107c6dae3c0aadf308 --date=short --no-merges --format=%ad %ae %s
2019-06-10 robertphillips@google.com Add P016 and P010 examples to wacky_yuv_formats GM
2019-06-10 ethannicholas@google.com SkSL vector divide by zero now properly reports an error
2019-06-10 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).

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