This re-lands commit c594696f.

The original PR was breaking the integration test as while the
gesture was active the AndroidView's parent widget got rebuilt which
disposed the _AndroidViewGestureRecognizer and dropped pointer events
from that point on.

This change adds a unit test that reproduces the failure case, and
fixes it by not rebuilding the _AndroidViewGestureRecognizer if the
list of gesture recognizers did not change.

ANDROID_HOME should be coming from the env, and it wasn't: it was being set in the script.

This reverts commit c594696f.

Pointer events are dispatched to the Android view only if it won
Flutter's gesture arena for the pointer.
Specific gestures that should be dispatched to the android view can be
specified with the gestureRecognizers parameter.

Add a countdown timer picker as part of the Cupertino date picker.

Note that such tests already exist for RaisedButton and MaterialButton

This allows to pass construction parameters for the embedded Android
view from the Dart side.

* Few readme fixes

* Fix link

* Make casing consistent

* Unskip expression evaluation integration tests for non-Windows

* Add additional into to skip comments

* Add missing import

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This adds ".pub-cache" to the list of directories to ignore when checking for dependence upon dart:test, since when people install a downloadable package, their pub cache is in the flutter directory.

Also, I centralized the ANSI "red line" so that they would all use the same final string.

This allows developers to control the clipBehavior of those buttons.

This updates the test to match the engine API change introduced in:
https://github.com/flutter/engine/pull/6081

This also rolls the engine, the roll includes only the relevant engine commit:
```
091492601 Allow passing extra creation parameters for embedded Android views. (#6081)
```

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Updating a few things on the README page. It needs more work.

Was marked as flaky as that's our policy for assing new device lab
tests. It's been consistently green so marking as non flaky.

This reverts commit 8de0e15e and
updates the goldens versoin.

This requires https://github.com/flutter/flutter/pull/20751 to
land first.

* added keyboard functionatliy to android builds

* Added tests

* almost ready for review

* ready for review

* Fixes

* final comments

* final commit

* removing raw keyboard changes

* removing raw keyboard changes

* removing raw keyboard changes

* actual last commit

* fixed the imports

* a few more changes

* A few more changes

* a few changes

* Final changes

* Final changes2

* final actual commit for real

* final actual commit for real2

* final actual commit for real3

* final actual commit for real4

* final

* final 2

* f

* f2

* fin

* fin 2

* fin3

* fin4

* Start logger in startProgress to avoid assertion failure

There are lots of places that create a Status() and all but two of them call ..start() immediately. This is one of the places that doesn't, which causes an assertion failure when running with --enable-asserts and the other is in the same file (I suspect it's also incorrect, but possibly it's never used - I'll look at that separately when I can trace some code that calls it).

Fixes #20812.

* Enable asserts for tools tests

* Fix lint

* Rename enableAsserts -> enableFlutterToolAsserts

To make it clearer that it only enables asserts for flutter_tools when set.

Virtual displays must have a non zero size. This was causing a crash:
https://github.com/flutter/flutter/issues/20456

* Strip upstream from footer

* cleanup (readd accidentally deleted whitespace)

add cupertino localizations abstract class and the default cupertino localizations in US English.

fixes #20940

Create flutter_driver infra for testing the Android AccessibilityNodeInfo generated by Flutter (#19700)

Auto-roller completed checks. Merging.

This includes the following changes
c62248bdd Roll src/third_party/skia 82cf64a0d317..33d5394d08f6 (14 commits) (#6068)
b0fb3e660 Roll src/third_party/skia 96597c22c344..82cf64a0d317 (12 commits) (#6067)
ea8b949a7 Roll src/third_party/skia 4d727c560b58..96597c22c344 (27 commits) (#6066)
4fde39583 Roll Dart to version ccb16f72824374163562364bf19dd18e8a882fab (#6065)
140a5b757 Alllow access to Flutter engine, Dart & Skia versions in the Shell API. (#6060)

Contains the following changes:
4fde39583 Roll Dart to version ccb16f72824374163562364bf19dd18e8a882fab (#6065)
140a5b757 Alllow access to Flutter engine, Dart & Skia versions in the Shell API. (#6060)