* Added support for authentication codes for the VM service.

Previously, a valid web socket connection would use the following URI:

`ws://127.0.0.1/ws`

Now, by default, the VM service requires a connection to be made with a
URI similar to the following:

`ws://127.0.0.1:8181/Ug_U0QVsqFs=/ws`

where `Ug_U0QVsqFs` is an authentication code generated and shared by
the
service.

This behavior can be disabled with the `--disable-service-auth-codes`
flag.

* add daemon.log to the daemon spec

* mention use in flutter run --machine

The 'doctor' check to determine if any devices can be listed for the
device should consider desktop workflows as well.

This has no effect unless the environment variable to enable desktop
device listing is set.

This PR makes a number of changes to the visual appearance of material sliders:

Sizes/Shapes
** enabled thumb radius from 6 to 10
** disabled thumb radius from 4 to 10 with no gap
** default track shape is a rounded rect rather than a rect
**
Colors
** all of the colors now use the new color scheme
** overlay opacity has been reduce from 16% to 12%
** value indicator text color now respects the indicator it is on by using onPrimary
** disabledThumb color no respects the surface it is on by using onSurface
The slider theme is also now constructed consistently with other theme objects within the ThemeData. By default, all values are null, and have default values that are resolved in the slider itself, rather than in the slider theme.

https://github.com/flutter/engine/compare/06fea14e5800...4b9966f5cb41

git log 06fea14e5800c35a4fc4dd10cc31b997f1be81e9..4b9966f5cb412a73fa50462b3aee9082f436a62a --no-merges --oneline
4b9966f5c Add an adjustment to the line width check in LineBreaker::addWordBreak (flutter/engine#8623)
60bb866ce Roll src/third_party/skia a94670bd08cd..2c2240f66805 (2 commits) (flutter/engine#8632)
a144f17ae Tight Paragraph Width (flutter/engine#8530)

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https://github.com/flutter/engine/compare/b6787096a2d3...06fea14e5800

git log b6787096a2d3d0365f03f4cfdb70b932e4e5bae3..06fea14e5800c35a4fc4dd10cc31b997f1be81e9 --no-merges --oneline
06fea14e5 Glitchiness with Tab Characters (flutter/engine#8591)

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b6787096a Roll src/third_party/skia 847d55be4e62..a94670bd08cd (1 commits) (flutter/engine#8631) (#31260)


https://github.com/flutter/engine/compare/3e6dc02ad62e...b6787096a2d3

git log 3e6dc02ad62ef9fa02660f5fb0bb114414e282d4..b6787096a2d3d0365f03f4cfdb70b932e4e5bae3 --no-merges --oneline
b6787096a Roll src/third_party/skia 847d55be4e62..a94670bd08cd (1 commits) (flutter/engine#8631)

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3e6dc02ad Roll src/third_party/skia ced2b79d00f9..847d55be4e62 (3 commits) (flutter/engine#8630) (#31251)


https://github.com/flutter/engine/compare/54f7c51339ae...3e6dc02ad62e

git log 54f7c51339ae7d86a983b5850b14dafe4e2bd90a..3e6dc02ad62ef9fa02660f5fb0bb114414e282d4 --no-merges --oneline
3e6dc02ad Roll src/third_party/skia ced2b79d00f9..847d55be4e62 (3 commits) (flutter/engine#8630)

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54f7c5133 Roll src/third_party/skia 14c90c1ca218..ced2b79d00f9 (1 commits) (flutter/engine#8629) (#31240)


https://github.com/flutter/engine/compare/70068706d0ee...54f7c51339ae

git log 70068706d0ee3bc9847632c4d0e467fba49271f8..54f7c51339ae7d86a983b5850b14dafe4e2bd90a --no-merges --oneline
54f7c5133 Roll src/third_party/skia 14c90c1ca218..ced2b79d00f9 (1 commits) (flutter/engine#8629)

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https://github.com/flutter/engine/compare/8b5a50c0df76...70068706d0ee

git log 8b5a50c0df768743dd9858cceb92d1d1de44c35e..70068706d0ee3bc9847632c4d0e467fba49271f8 --no-merges --oneline
70068706d Allow building without python2 (flutter/engine#8605)

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https://github.com/flutter/engine/compare/876c4c339064...8b5a50c0df76

git log 876c4c339064ed321f37fba61422194d84cbfdb7..8b5a50c0df768743dd9858cceb92d1d1de44c35e --no-merges --oneline
8b5a50c0d Test saving compilation traces. (flutter/engine#8618)
7d3caf895 Avoid leaking the VM in runtime_unittests and update failing tests. (flutter/engine#8626)
91b71070f Revert "Add a unit test for PhysicalShapeLayer (#8616)" (flutter/engine#8627)
8b667b017 Add a unit test for PhysicalShapeLayer (flutter/engine#8616)

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https://github.com/flutter/engine/compare/76794745b676...876c4c339064

git log 76794745b6764246cffafb237182f7fafeac41f8..876c4c339064ed321f37fba61422194d84cbfdb7 --no-merges --oneline
876c4c339 Assert that all VM launches in the process have the same opinion on whether the VM should be leaked in the process. (flutter/engine#8622)
72c84c287 Revert "Roll src/third_party/dart 7b9ab9f353..714a082a5d (7 commits)" (flutter/engine#8624)
f017fe74a Avoid manually shutting down engine managed isolates. (flutter/engine#8621)
80e934e32 Roll src/third_party/dart 7b9ab9f353..714a082a5d (7 commits)

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https://github.com/flutter/engine/compare/523a9a9adde9...76794745b676

git log 523a9a9adde96d22c801eac59f9f6db3d2a79a30..76794745b6764246cffafb237182f7fafeac41f8 --no-merges --oneline
76794745b Roll src/third_party/skia 6f9047027be3..14c90c1ca218 (5 commits) (flutter/engine#8619)
d8aa6bca1 Fix typo in comment (flutter/engine#8617)
8ff631f3d Rename flow namespace to flutter (flutter/engine#8615)
0534b6ae5 Roll src/third_party/dart bc99f1ca28..7b9ab9f353 (5 commits)
b767e4d3c Roll src/third_party/skia 5155e09d1466..6f9047027be3 (5 commits) (flutter/engine#8613)
c5d1ba916 Remove call to SkFont::setLinearMetrics (flutter/engine#8612)

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Will cause golden and Scuba changes. Caret will become taller and shift upwards by 2 pixels.

https://github.com/flutter/engine/compare/fdd427241b77...523a9a9adde9

git log fdd427241b7790a1ad86794725b311245ed3b470..523a9a9adde96d22c801eac59f9f6db3d2a79a30 --no-merges --oneline
523a9a9ad Add FLEPluginRegistry for macOS (flutter/engine#8611)
dd9dcaf9a [fuchsia] Fix SceneUpdateContext for new PaintContext field (flutter/engine#8608)
0e27e0fc3 Pipe Z bounds from ViewportMetrics to Flow (flutter/engine#8583)
f62ab83ba Roll src/third_party/dart f0da03ca36..bc99f1ca28 (1 commits)
7b38aef03 Roll src/third_party/skia 33906ad1e26f..5155e09d1466 (4 commits) (flutter/engine#8609)
b0dedbd60 Roll src/third_party/dart d9c40462c2..f0da03ca36 (1 commits)
f88ba6e43 Roll src/third_party/skia e88d4382e1cf..33906ad1e26f (1 commits) (flutter/engine#8604)
53c0905b1 Roll src/third_party/skia 652b007a4cbb..e88d4382e1cf (4 commits) (flutter/engine#8603)
4266f8583 Add desktop shell unittests to test script (flutter/engine#8600)
8156268f0 Roll src/third_party/dart 8e73b3c006..d9c40462c2 (4 commits)

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https://github.com/flutter/engine/compare/388124f948e6...fdd427241b77

git log 388124f948e685fd545c4363bcecbaeae911b4c5..fdd427241b7790a1ad86794725b311245ed3b470 --no-merges --oneline
fdd427241 Roll src/third_party/skia 70ed05e53ad2..652b007a4cbb (1 commits) (flutter/engine#8601)
3b016106c Check that TransformLayer has a finite matrix (flutter/engine#8585)
4805d72a4 Implement StandardMethodCodec for C++ shells (flutter/engine#8598)

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388124f94 Roll src/third_party/skia db13d3874846..70ed05e53ad2 (6 commits) (flutter/engine#8599) (#31170)


https://github.com/flutter/engine/compare/b819b62bed3f...388124f948e6

git log b819b62bed3ffedf729ac1daddcc8bf7885e9982..388124f948e685fd545c4363bcecbaeae911b4c5 --no-merges --oneline
388124f94 Roll src/third_party/skia db13d3874846..70ed05e53ad2 (6 commits) (flutter/engine#8599)

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https://github.com/flutter/engine/compare/db36d28ed074...b819b62bed3f

git log db36d28ed074b8b4f018ce6f7cb93b4e8ffcf456..b819b62bed3ffedf729ac1daddcc8bf7885e9982 --no-merges --oneline
b819b62be Variant type for C++ client wrapper (flutter/engine#8592)

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https://github.com/flutter/engine/compare/c0ee647ca422...db36d28ed074

git log c0ee647ca4226fcb38a5af178a97ce8ba9129184..db36d28ed074b8b4f018ce6f7cb93b4e8ffcf456 --no-merges --oneline
db36d28ed Roll src/third_party/dart a8f3a5dae6..8e73b3c006 (92 commits)

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* Revert "Use full height of the glyph for caret height on Android (#30991)"

This reverts commit 96e1fc9c.

https://github.com/flutter/engine/compare/7af3f2b9e7c5...c0ee647ca422

git log 7af3f2b9e7c5f911ef4b1cff37aa5088fad6dbf5..c0ee647ca4226fcb38a5af178a97ce8ba9129184 --no-merges --oneline
c0ee647ca Roll src/third_party/skia 68aeec07de4a..db13d3874846 (16 commits) (flutter/engine#8595)
28a46d51a Composite Embedded Views with the correct GrContext

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https://github.com/flutter/engine/compare/7d1da567434a...7af3f2b9e7c5

git log 7d1da567434a820853ed6fae1f6ed65b9de5ba4f..7af3f2b9e7c5f911ef4b1cff37aa5088fad6dbf5 --no-merges --oneline
7af3f2b9e Roll buildroot to ce7b5c786a12927c9e0b4543af267d48c52e0b3a (flutter/engine#8593)
d2eeceb94 Roll src/third_party/skia 6c431d52020c..68aeec07de4a (7 commits) (flutter/engine#8590)

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This version of dartdoc properly escapes fenced code block "info strings."