This reverts commit a57dddd2.

* implicit-casts:false in flutter_goldens and flutter_goldens_client

* fix type

git@github.com:flutter/engine.git/compare/6bf311f1d62c...7a77e3625dd1

git log 6bf311f1d62c..7a77e3625dd1 --no-merges --oneline
2019-11-21 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from bC9Qy... to FQdiV... (flutter/engine#13936)
2019-11-21 skia-flutter-autoroll@skia.org Roll src/third_party/skia 935a35d972e5..f9291b8942d8 (13 commits) (flutter/engine#13938)
2019-11-21 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from 7mmHP... to VHWsK... (flutter/engine#13939)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC aaclarke@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

git@github.com:flutter/engine.git/compare/176f56329631...6bf311f1d62c

git log 176f56329631..6bf311f1d62c --no-merges --oneline
2019-11-20 bkonyi@google.com Roll src/third_party/dart b188632458..867a6e0e52 (4 commits) (flutter/engine#13948)
2019-11-20 gw280@google.com Ensure we use the base CompositorContext's AcquireFrame method when screenshotting (flutter/engine#13934)
2019-11-20 chinmaygarde@google.com Update SwiftShader to 5d1e854. (flutter/engine#13945)
2019-11-20 ianloic@google.com [flutter_runner] fix a11y tests (flutter/engine#13947)
2019-11-20 bkonyi@google.com Roll src/third_party/dart 8342ec2c71..b188632458 (2 commits) (flutter/engine#13942)
2019-11-20 ferhat@gmail.com Fix edge detection for correct dom_renderer reset (flutter/engine#13940)
2019-11-20 bkonyi@google.com Roll src/third_party/dart 1f933abcee..8342ec2c71 (12 commits) (flutter/engine#13941)
2019-11-20 50856934+nturgut@users.noreply.github.com [web] Flutter for web autocorrect support (flutter/engine#13922)
2019-11-20 skia-flutter-autoroll@skia.org Roll src/third_party/skia e678b79c489d..935a35d972e5 (13 commits) (flutter/engine#13927)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC aaclarke@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

Typo in a title in a gallery demo

This reverts commit 6b5634fe.

This reverts commit 399aebc4.

It contained Apache 2.0 licensed files, which aren't allowed in flutter/flutter

This reverts commit 421bf647.

Was causing severe breakages in Google.

* Enable asserts

See https://github.com/flutter/flutter/issues/36476

* Remove comment

This reverts commit 99324105.

It was implicated in https://github.com/flutter/flutter/issues/45258

Update the Slider and RangeSlider to the latest Material spec. This introduces an updated track, updated thumbs, updated tick marks, and a new value indicator shape. The old paddle value indicator shape is also updated so that text scaling works consistently.

This reverts commit 2135e9fb.

* f240462bb Implement basic text rendering support in CanvasKit backend (flutter/engine#13903)

* ffcd8564a Imagefilter wrapper object (flutter/engine#13711)

* 176f56329 Roll src/third_party/dart eeca3fb1cb..1f933abcee (7 commits) (flutter/engine#13931)

https://github.com/flutter/engine/compare/c812a62b8810...2d35b4ec1f04

Expose the platform view mutator stack to custom compositors. (flutter/engine#13731)
Roll fuchsia/sdk/core/linux-amd64 from T9BAw... to 7mmHP... (flutter/engine#13924)
Changing test runner and platform to be browser independent (flutter/engine#13869)
Roll Skia to e678b79c489d (2 commits) (flutter/engine#13923)

git@github.com:flutter/engine.git/compare/f4fba66c2fad...c812a62b8810

git log f4fba66c2fad..c812a62b8810 --no-merges --oneline
2019-11-19 jonahwilliams@google.com allow ignoring toString, hashCode, and == in api_conform_test (flutter/engine#13907)
2019-11-19 bkonyi@google.com Roll src/third_party/dart d9d5fbc109..eeca3fb1cb (5 commits)
2019-11-19 chinmaygarde@google.com Add virtual destructor to GPUSurfaceSoftwareDelegate. (flutter/engine#13918)
2019-11-19 47866232+chunhtai@users.noreply.github.com Moves pointer event sanitizing to engine. (flutter/engine#13697)

Before this change, it was possible to move the focus onto a control that was no longer in the view using focus traversal. This changes that, so that when a control is focused, it makes sure that if it is the child of a scrollable, that the scrollable attempts to keep it in view. If it is already in view, then nothing scrolls.

When asked to move in a direction, the focus traversal code tries to find a control to move to inside the scrollable first, and then looks for things outside of the scrollable only once the scrollable has reached its limit in that direction.

This reverts commit 6d77996d.

This will catch issues like
https://github.com/flutter/flutter/issues/44252, and this test is
inspired by the `list_demo` sample app in
https://github.com/flutter/flutter/issues/43083#issue-509586473

This is tested locally on a Moto G4 before and after the fix
https://github.com/flutter/engine/pull/13710

The `average_frame_rasterizer_time_millis` of this test drops from
~5.4ms to ~4.9ms after that fix.

* reland add lifecycle enum and fix the scheduleforcedframe

f4fba66 Adding opacity -> alpha method to Color class (flutter/engine#13902)
86e82fc Roll src/third_party/skia d3ddcb403993..c5e528e15b1f (1 commits) (flutter/engine#13916)
84ed7be [web] Implement PathMetrics.length (flutter/engine#13909)
2b007ed Roll fuchsia/sdk/core/mac-amd64 from 8X5fE... to bC9Qy... (flutter/engine#13919)
ad0cbdc Roll src/third_party/dart 5b72c1c669..d9d5fbc109 (5 commits) (flutter/engine#13917)
c4c1e57 Roll src/third_party/skia d4fb7c7b140d..d3ddcb403993 (21 commits) (flutter/engine#13915)
38147fa Roll fuchsia/sdk/core/linux-amd64 from kSMF7... to T9BAw... (flutter/engine#13914)
7c5ed6c Roll src/third_party/dart 62c67e40dc..5b72c1c669 (17 commits)
72b6a7e Roll buildroot to a985f7f63ac. (flutter/engine#13910)
e16a4b7 Roll fuchsia/sdk/core/mac-amd64 from Oo6E_... to 8X5fE... (flutter/engine#13912)
47e1026 Roll src/third_party/skia c9d263c1213e..d4fb7c7b140d (7 commits) (flutter/engine#13897)

This fixes the sample code analysis to treat dartpad snippets in the same way as snippet snippets, which it wasn't until now (the snippet generator was treating them as "samples"), and some errors crept in. This PR also fixes those errors.

Also, added a --verbose option to the sample analyzer.