There is a race where we could complete a future based on a stream event
and then before we cancel the stream subscription, we get another event
and try and complete the future again.

* improve progress display when running apps; speed up startup

* review comments

* comprehensive list of lints
* add comments to commented out lint
* fix unnecessary_this lints
* exclude prefer_final_fields

These tests have recently been turning the build red incorrectly. Until they are reliable, let's mark them flaky.

A change in overflow mode requires calculation of the text size and resetting
the overflow shader

Subsequent operations like debugAssertDoesMeetConstraints() may do layout
operations that alter _textPainter's state.

Fixes https://github.com/flutter/flutter/issues/9372

* Remove FadeTransition from _MountainViewFadeTransition.
* Update tests.

Turns out we have many immutable classes.

Fixes #6892

- [x] Switch the reassemble timeout to 5 seconds.
- [x] Print a status message if reassemble fails:

```
Performing hot reload...
Reassembling app.flx$main took too long. Hot reload may have failed.
Reloaded 0 of 418 libraries in 5,322ms.
```

Fixes #9316
Fixes #8861
Fixes #8857
Fixes #8856

- [x] Refresh FlutterViews before issuing a hot reload / restart

Fixes #7248

- [x] Resume the isolate before performing a hot restart.

Fixes #8923

* Make Cupertino page transition elevation animated too

* Rename and change physical model to a decorated box

* Tests

* Add a comment

* still need to handle null in the tween somewhere

* nits

* Tweens evaluate to the actual begin/end instances. Let them be non-null

* Rename no decoration to none

- [x] Catch SocketErrors and handle them gracefully.
- [x] Print 'Lost connection to device' when the service protocol connection is severed unexpectedly.
- [x] Print 'Application finished' when the application exits otherwise.

After this PR:

```
Launching lib/main.dart on Nexus 7 in debug mode...
Running 'gradle assembleDebug'...                     1.2s
Built build/app/outputs/apk/app-debug.apk (21.7MB).
Syncing files to device...
Application finished.
DevFS sync failed. Lost connection to device: SocketException: OS Error: Connection refused, errno = 111, address = 127.0.0.1, port = 53062
Could not perform initial file synchronization.
```

Fixes #6705