This reverts commit 0636c6fe.

Disallow calling stop() or cancel() multiple times. This means that
when you use startProgress you have to more carefully think about what
exactly is going on.

Properly cancel startProgress in non-ANSI situations, so that
back-to-back startProgress calls all render to the console.

Pull in new versions of packages with fixes for SCREAMING CAPS CONSTANTS.

* Revert "Revert "Roll engine to 7d17da76d (#19785)" (#19792)"

This reverts commit e1a3e1bf.

This reverts commit 8adecb62.

```
7d17da76d Package Skia licenses into a separate file from other third party libraries (#5861)
d2d8bf394 Pass touch events to embedded Android views with dispatchTouchEvents.
216908652 Synthesize Android MotionEvents with the long form obtain method.
0b4432769 Roll src/third_party/skia 396661825f45..1c94a8fabed7 (8 commits) (#5859)
f50e218d9 Rename clip mode to clip behavior (#5853)
42bd86d6d Make the virtual display's presentation window non focusable. (#5845)
a726e1d85 Roll src/third_party/skia c062b6be5a01..396661825f45 (3 commits) (#5857)
3fa83d2d2 Roll src/third_party/skia 15020ea2cf44..c062b6be5a01 (1 commits) (#5856)
75ad43954 Roll src/third_party/skia 4c7a750e5543..15020ea2cf44 (1 commits) (#5855)
5cd8b4530 Roll src/third_party/skia 75e5406be66a..4c7a750e5543 (2 commits) (#5854)
e12b52841 Roll src/third_party/skia b8eeb808d84f..75e5406be66a (17 commits) (#5852)
5bc1e68b6 Remove check_roll from Travis (#5846)
```

Our Cirrus Windows tests were not really working: they reported success even when failing.

This should fix several problems with the Cirrus Windows tests.

* Just commiting two files now

* Fixed one tab

* Fixed latest changes

* Changed the data structure from a map to a single radio panel object

* A few more changes

* Fixed change from expansion radio to regular list

* Fixed change from expansion radio to regular list2

* Changed the radio constructor

* Last fixes

* Final commit

* Actual final commit

* Last change

the thumbnail is not related to the link anymore 
https://github.com/flutter/flutter/issues/17380

These are bugs uncovered by the integration test for embedded Android
views:

  * Some PointerEvents were constructed with radiusMinor set to
  radiusMajor.
  * Some PointerEvents were missing radiusMajor/radiusMinor.
  * The pressure parameter was not passed to PointerUpEvent.
  * radiusMin, radiusMax, radiusMinor, and radiusMajor were not
  converted from physical pixels to logical.

Sending the fixes without a test as the bugs are covered by the integration
test that is going to land soon.

Updated documentation of SizeTransition, since I found it less than intuitive.

I added some constructor asserts to make the (existing) contract more clear.

* Skip integration tests that use flutter-tester on Windows

This is known to be broken. I will un-skip all of these once a fix for flutter-tester lands on Windows.

* Save with added import!

* Add tests to ensure flutter run does not quit at startup

These tests require https://github.com/dart-lang/vm_service_client/pull/38 to be merged and currently the third test (pause-on-exceptions) fails because of a bug.

* Remove TODO

Probably makes most sense this way for now.

* Address PR comments

* Look up breakpoints rather than relying on magic numbers

* Make breakpoint comment more obvious

Samsung Galaxy S9 is not an emulator and installation of
the release packages with 'flutter run --release' should be possible.

* Add `--dry-run` option to `flutter format` sub command

* Add `--set-exit-if-changed` option to `format` sub command

* Add `--machine` option to `format` sub command

* Make variable names to be not shorthand: cmd -> command

Fix https://github.com/flutter/flutter/pull/18360#discussion_r199656120

This reverts commit 38407199.

Bug: https://github.com/flutter/flutter/issues/19435

95e91e31f Update tonic to pull in Android build fixes. (#5834)
29f475c8d Update tonic to pull in fixes to assertions and build failures on Windows. (#5833)
5474415e1 Roll src/third_party/skia e35055f31c7f..b8eeb808d84f (5 commits) (#5832)
380eb84c4 Remove unused function CreateSkiaInterface (#5812)
33a4aef1d Fix build break caused by https://github.com/flutter/engine/pull/5830 (#5831)
244ebd660 Reapply "Fix Dart 2 reload when running from a snapshot instead of platform.dill." (#5830)
0bad812c7 Migrate to a standalone Tonic repository separated from Topaz (#5817)
f949f7d43 Roll src/third_party/skia 206dbe8a21b6..e35055f31c7f (1 commits) (#5829)
768daa4d3 Roll src/third_party/skia 5e6cd2affe41..206dbe8a21b6 (5 commits) (#5828)
b8cd25b4f libtxt: fix a bug that used incorrect buffer size depending on conditions (#5804)
b7b13b5e9 Roll src/third_party/skia df795638b9bd..5e6cd2affe41 (1 commits) (#5824)
5886949c9 Roll src/third_party/skia dfe1fe40796e..df795638b9bd (1 commits) (#5822)
926f546de Roll src/third_party/skia cc22d4d2fb02..dfe1fe40796e (1 commits) (#5821)
04633f326 Generate process global trace identifiers for pipeline flow traces. (#5818)
fb0bc05d7 Roll src/third_party/skia 6f6de6524c73..cc22d4d2fb02 (1 commits) (#5820)
fadfff7fd Mention that running git clone isn't necessary (#5816)
81ec6000d Roll src/third_party/skia d3509a42638a..6f6de6524c73 (5 commits) (#5819)
2a77a4130 Make git diff range more robust in format.sh (#5813)
e555ea573 Remove trailing white spaces (#5734)
4c7618ac7 Roll src/third_party/skia fa0720436319..d3509a42638a (7 commits) (#5814)

Changes:

- Move the SemanticsConfiguration update from RenderToggleable to each subclass, so that Switch can use toggled.
- Add image, liveRegion, toggled properties to Semantics, SemanticsConfiguration, SemanticsNode
- Added semanticsLabel and excludeFromSemantics to Image (the latter so that we avoid creating a semantics node)
- Added onDismiss semantics action which maps to the modal escape on iOS and dismiss action on Android.
- Added dismiss and liveRegion to snackbar widget
- Updated custom painter semantics to handle image, liveRegion, toggle
- Updated relevant tests to use correct flag/action

Added five InputBorder properties to InputDecoration etc so that apps can control the appearance of an InputDecorator's border:  errorBorder, focusedBorder, focusedErrorBorder, disabledBorder, enabledBorder.

* fixed segmented control golden test

* fixed segmented control golden test

* made the comments more explanatory

* changed comment, wrapped tests with if statements so they only run on MacOS

* changed formatting

* added width and radius fields to TextField; to do: tests and Material defaults

* weak warnings

* added tests

* added default cursor width; changed default EditableText width

* only run golden file tests on linux

* changed goldens version

* actually changed goldens.version

* style changes

* small fixes

* added default material cursor color

* changed goldens.version

* changed goldens version again

* changed goldens.version again (3)

* added todo

* deleted whitespace

The trailing whitespace detector wasn't handling file deletes very well (at all, really).

This filters the set of files grepped to only include files that exist.

Also, clarified the failure message to make it more obvious what the failure is when the grep finds results.