This reverts commit f4fba6d7.

Reference to `accessibilityFlags` corrected to `accessibilityFeatures`.

https://skia.googlesource.com/skia.git/%2Blog/e0a6a048bc4a..7738736f9622

git log e0a6a048bc4a9cd29e2d1d4ac6d36153c1bce3c1..7738736f96222dd326129095cc95f31845ba57be --date=short --no-merges --format=%ad %ae %s
2019-02-20 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 0a60818466f1..7f8fa973f84b (1 commits)
2019-02-20 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update go_deps asset
2019-02-19 recipe-roller@chromium.org Roll recipe dependencies (trivial).
2019-02-20 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 aca30f56ddc0..3d544fffe7ff (3 commits)

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Fixes a minor pluralisation error in docs for didGainAccessibilityFocus,
didLoseAccessibilityFocus.

https://skia.googlesource.com/skia.git/%2Blog/249a25730521..e0a6a048bc4a

git log 249a2573052167220fdb90828a5df43bfcaa3a07..e0a6a048bc4a9cd29e2d1d4ac6d36153c1bce3c1 --date=short --no-merges --format=%ad %ae %s
2019-02-19 recipe-roller@chromium.org Roll recipe dependencies (trivial).
2019-02-19 reed@google.com add colorspace param to textblobdiff canvas

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https://skia.googlesource.com/skia.git/%2Blog/ce62dec02293..249a25730521

git log ce62dec02293670e2941be8bef87b8f3d5da6c35..249a2573052167220fdb90828a5df43bfcaa3a07 --date=short --no-merges --format=%ad %ae %s
2019-02-19 robertphillips@google.com Fix bookmaker dox for SkSurface::MakeRenderTarget
2019-02-19 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 6397ed0fc311..0a60818466f1 (2 commits)
2019-02-19 recipe-roller@chromium.org Roll recipe dependencies (trivial).
2019-02-19 recipe-roller@chromium.org Roll recipe dependencies (trivial).
2019-02-15 bungeman@google.com Make SkShaper an interface.
2019-02-19 brianosman@google.com Fix layout feedback loop in particle GUI
2019-02-19 recipe-roller@chromium.org Roll recipe dependencies (trivial).
2019-02-19 michaelludwig@google.com Only perform matrix concat when actually logging histograms
2019-02-19 brianosman@google.com Add comments to document SkCurve
2019-02-19 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader a63e5f9685a6..6397ed0fc311 (1 commits)
2019-02-19 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src ee506c5149cb..bf1a36e53e69 (229 commits)
2019-02-19 brianosman@google.com First pass comments to document SkReflected.h
2019-02-19 herb@google.com Clarify parameter naming for setMinAndMaxScale
2019-02-19 recipe-roller@chromium.org Roll recipe dependencies (trivial).
2019-02-19 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 24021a2d7ea5..a63e5f9685a6 (1 commits)

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This reverts commit 3a1b9b3d.

This reverts commit 0d6ff166.

This reverts commit 68d9ac44.

https://github.com/flutter/engine/pull/7759 has landed without any
unexpected regressions. Hence we'll reland this as planned.

https://skia.googlesource.com/skia.git/%2Blog/90791e27d8a2..ce62dec02293

git log 90791e27d8a286c50185e000bd9b32bb9a2f557d..ce62dec02293670e2941be8bef87b8f3d5da6c35 --date=short --no-merges --format=%ad %ae %s
2019-02-19 michaelludwig@google.com Add general quad methods to GrRTC
2019-02-19 robertphillips@google.com Switch FP creation over to GrRecordingContext
2019-02-19 michaelludwig@google.com Formalize edge-aa interaction with GrAA
2019-02-19 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 6a492c277e9f..aca30f56ddc0 (1 commits)
2019-02-19 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 6d74ab852bf2..24021a2d7ea5 (1 commits)
2019-02-19 reed@google.com simplify even more the new setlength impl
2019-02-19 brianosman@google.com Remove SkField, it's no longer used
2019-02-15 bungeman@google.com Add asserts to SkTextBlobBuilderRunHandler.

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https://skia.googlesource.com/skia.git/%2Blog/e27ee6c503cf..90791e27d8a2

git log e27ee6c503cf94cae4987414047a1bd250703ecf..90791e27d8a286c50185e000bd9b32bb9a2f557d --date=short --no-merges --format=%ad %ae %s
2019-02-19 halcanary@google.com SkPaint: make bitfield defaults more explicit
2019-02-19 mtklein@google.com add gbr --config
2019-02-15 michaelludwig@google.com Add general quad factories to GrFillRectOp and GrTextureOp
2019-02-19 reed@google.com check math in stroker
2019-02-15 scroggo@google.com SkWuffsCodec: Initialize when incomplete part 3
2019-02-18 benjaminwagner@google.com [infra] Add back valgrind dimension for Valgrind tasks

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Adds 'add', 'remove', and 'hover' to the set of pointer phases that are
available to embedders. This is necessary for them to send hover events
to the engine.

https://skia.googlesource.com/skia.git/%2Blog/ef2489f8b0bb..e27ee6c503cf

git log ef2489f8b0bb1c831a239389e2686bc54a1890df..e27ee6c503cf94cae4987414047a1bd250703ecf --date=short --no-merges --format=%ad %ae %s
2019-02-15 bungeman@google.com Remove build work-around.

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https://skia.googlesource.com/skia.git/%2Blog/2afee77b48ab..ef2489f8b0bb

git log 2afee77b48ab0cf942f4211599643897c3d08f87..ef2489f8b0bb1c831a239389e2686bc54a1890df --date=short --no-merges --format=%ad %ae %s
2019-02-19 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update go_deps asset

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https://skia.googlesource.com/skia.git/%2Blog/d6c69d21635e..2afee77b48ab

git log d6c69d21635e08acaaec167d77773e2557f8969a..2afee77b48ab0cf942f4211599643897c3d08f87 --date=short --no-merges --format=%ad %ae %s
2019-02-19 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 028df5f51e45..6a492c277e9f (1 commits)

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https://skia.googlesource.com/skia.git/%2Blog/2ccdd2bc1d01..d6c69d21635e

git log 2ccdd2bc1d01566210bcba5fbac2a4bf31f15845..d6c69d21635e08acaaec167d77773e2557f8969a --date=short --no-merges --format=%ad %ae %s
2019-02-18 reed@google.com Experiment: always use doubles for setLength
2019-02-18 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 6d56209983a0..ee506c5149cb (152 commits)

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https://skia.googlesource.com/skia.git/%2Blog/068f3418a2db..2ccdd2bc1d01

git log 068f3418a2db3d6b3bb92d28e8f6d482d5d820cd..2ccdd2bc1d01566210bcba5fbac2a4bf31f15845 --date=short --no-merges --format=%ad %ae %s
2019-02-15 halcanary@google.com SkQP: android.support.test -> androidx.test
2019-02-18 halcanary@google.com DEPS: follow on to Bug: skia:8772

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https://skia.googlesource.com/skia.git/%2Blog/5ba2a8a5b24f..068f3418a2db

git log 5ba2a8a5b24f6ad0e2f05b2c80e25b31b842d0e7..068f3418a2db3d6b3bb92d28e8f6d482d5d820cd --date=short --no-merges --format=%ad %ae %s
2019-02-18 recipe-roller@chromium.org Roll recipe dependencies (trivial).

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https://skia.googlesource.com/skia.git/%2Blog/f2cf73c8cd46..5ba2a8a5b24f

git log f2cf73c8cd46891dd21ce028c54312148a32775e..5ba2a8a5b24f6ad0e2f05b2c80e25b31b842d0e7 --date=short --no-merges --format=%ad %ae %s
2019-02-17 recipe-roller@chromium.org Roll recipe dependencies (trivial).
2019-02-16 iannucci@chromium.org [recipes] Manual roll.

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https://skia.googlesource.com/skia.git/%2Blog/346ce63daa51..f2cf73c8cd46

git log 346ce63daa511ffc7fd728aa0698097274b91462..f2cf73c8cd46891dd21ce028c54312148a32775e --date=short --no-merges --format=%ad %ae %s
2019-02-17 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src eda06a0b859a..6d56209983a0 (38 commits)

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https://skia.googlesource.com/skia.git/%2Blog/880b6ea52bf0..346ce63daa51

git log 880b6ea52bf00ea9621ee90e6b48f7fbc453fe8d..346ce63daa511ffc7fd728aa0698097274b91462 --date=short --no-merges --format=%ad %ae %s
2019-02-16 fmalita@chromium.org Add a SkMixerColorFilter GM

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https://skia.googlesource.com/skia.git/%2Blog/21950b9e9236..880b6ea52bf0

git log 21950b9e92367948439000448e62079ccd5e84f1..880b6ea52bf00ea9621ee90e6b48f7fbc453fe8d --date=short --no-merges --format=%ad %ae %s
2019-02-17 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update SKP version

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https://skia.googlesource.com/skia.git/%2Blog/eda2a8112596..21950b9e9236

git log eda2a8112596dff766b24abdcedf981e5a69015d..21950b9e92367948439000448e62079ccd5e84f1 --date=short --no-merges --format=%ad %ae %s
2019-02-17 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update go_deps asset

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https://skia.googlesource.com/skia.git/%2Blog/6cd82342937a..eda2a8112596

git log 6cd82342937a2835129fea44b6f62b0d23dc2d35..eda2a8112596dff766b24abdcedf981e5a69015d --date=short --no-merges --format=%ad %ae %s
2019-02-16 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 b6c1c66d2547..028df5f51e45 (4 commits)

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https://skia.googlesource.com/skia.git/%2Blog/0b496ff92fce..6cd82342937a

git log 0b496ff92fce253b21ed9e72ab796de0ba50526b..6cd82342937a2835129fea44b6f62b0d23dc2d35 --date=short --no-merges --format=%ad %ae %s
2019-02-16 fmalita@chromium.org Simplify optional input handling in SkMixerColorFilter

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https://skia.googlesource.com/skia.git/%2Blog/e876ec79ceff..0b496ff92fce

git log e876ec79ceff47b3ebf669b6d65686517ee3585d..0b496ff92fce253b21ed9e72ab796de0ba50526b --date=short --no-merges --format=%ad %ae %s
2019-02-16 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 5862f084f69f..eda06a0b859a (305 commits)

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https://skia.googlesource.com/skia.git/%2Blog/b7c7b7883b23..e876ec79ceff

git log b7c7b7883b2377e55e5def16560b1429958e0ec3..e876ec79ceff47b3ebf669b6d65686517ee3585d --date=short --no-merges --format=%ad %ae %s
2019-02-15 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader a0a80b160c6b..6d74ab852bf2 (1 commits)
2019-02-15 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 aead8edf8c46..b6c1c66d2547 (3 commits)
2019-02-15 robertphillips@google.com Make asFragmentProcessor entry point only take a GrRecordingContext (take 2)
2019-02-16 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update go_deps asset
2019-02-15 reed@google.com update docs for paint

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This reverts commit d48de7a3.

https://skia.googlesource.com/skia.git/%2Blog/be9aff25bddc..b7c7b7883b23

git log be9aff25bddc3eecf84d9c37af222ea40c261cb1..b7c7b7883b2377e55e5def16560b1429958e0ec3 --date=short --no-merges --format=%ad %ae %s
2019-02-15 herb@google.com Remove all empty glyph processing
2019-02-15 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 0eba65b14b60..a0a80b160c6b (1 commits)
2019-02-15 robertphillips@google.com Revert "Make asFragmentProcessor entry point only take a GrRecordingContext"
2019-02-15 reed@google.com make float more primary API for paint (esp. for alpha)
2019-02-15 halcanary@google.com tools/skqp/release.sh: Add Instant and ABI XML tags
2019-02-15 robertphillips@google.com Make asFragmentProcessor entry point only take a GrRecordingContext
2019-02-15 robertphillips@google.com Switch GrSurfaceProxy's Copy methods over to GrRecordingContext
2019-02-15 robertphillips@google.com Begin switching GrRecordingContext over to having the GrDrawingManager
2019-02-15 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 2bb0864b22e7..0eba65b14b60 (21 commits)
2019-02-15 robertphillips@google.com Add addOnFlushCallbackObject at GrRecordingContext level
2019-02-15 brianosman@google.com Moved image params out to SkParticleDrawable
2019-02-15 scroggo@google.com Remove assert that BGRA and RGBA are not opaque
2019-02-15 herb@google.com Revert of CL/192440 which would not reland cleanly.
2019-02-15 fmalita@chromium.org add mixer colorfilter
2019-02-13 csmartdalton@google.com Remove shader caps argument from GrGLSLTypeString
2019-02-15 robertphillips@google.com Stop using resourceProvider in GrRenderTargetContext's ctor
2019-02-15 halcanary@google.com ICU: enable on wasm

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Note: the SetTranslationRH function is temporary and part of the smooth
transition plan for Scenics handedness inversion. See SCN-1054 for details.

We will follow this will a change to migrate back off SetTranslationRH
Submit after https://fuchsia-review.googlesource.com/c/fuchsia/+/255056
lands in fuchsia.git

From build log:
```
../../flutter/shell/platform/android/io/flutter/view/FlutterView.java:95: error: cannot find symbol
    private final LocalizationChannel localizationChannel;
                  ^
  symbol:   class LocalizationChannel
  location: class FlutterView
../../flutter/shell/platform/android/io/flutter/view/FlutterView.java:172: error: cannot find symbol
        localizationChannel = new LocalizationChannel(dartExecutor);
                                  ^
  symbol:   class LocalizationChannel
  location: class FlutterView
2 errors
```

This reverts commit 256db4bc.

The shell was already designed to cleanly shut down the VM but it couldnt
earlier as |Dart_Initialize| could never be called after a |Dart_Cleanup|. This
meant that shutting down an engine instance could not shut down the VM to save
memory because newly created engines in the process after that point couldn't
restart the VM. There can only be one VM running in a process at a time.

This patch separate the previous DartVM object into one that references a
running instance of the DartVM and a set of immutable dependencies that
components can reference even as the VM is shutting down.

Unit tests have been added to assert that non-overlapping engine launches use
difference VM instances.

On Android we were never deleting the textures allocated for
the texture registry, which resulted in a memory leak, see:
https://github.com/flutter/flutter/issues/24145