This reverts commit 68fc7231.

This should fix https://github.com/flutter/flutter/issues/31442 and https://github.com/flutter/flutter/issues/34867

* use sentence case in error message titles

* add a test

* more ui-as-code

* address review comments

https://github.com/dart-lang/sdk/issues/36900

This re-applies the changes that were made in #33697 and #33729,
but which were reverted in #33792 and #33790, respectively due to
the Dart SDK not having received the update within Google yet.
The SDK has now rolled, so these changes can be re-applied.

https://github.com/flutter/flutter/issues/32374
https://github.com/flutter/flutter/issues/33791

This reverts commit 90500a5d.

This reverts commit 306a09a3.

This updates to use the new HttpClientResponse.compressionState
API that was recently added in the SDK.

https://github.com/flutter/flutter/issues/32374

* Deprecates `BinaryMessages` in favor of a default instance of `BinaryMessenger`, called `defaultBinaryMessenger`
* Platform channels use the `defaultBinaryMessenger` for their binaryMessenger default argument.

This is another step towards supporting image loading
progress notification at the widgets layer.

This adds an `ImageChunkEvent` class along with associated
`ImageChunkListener` callback signature and an `onChunk`
property to `ImageStreamListener`. The events serve to
notify registered listeners when byte chunks are received
while loading an image.

https://github.com/flutter/flutter/issues/32374

This will allow us to plumb the chunks in a chunked response
up to the higher levels of the framework to notify interested
parties of network loading progress.

https://github.com/flutter/flutter/issues/32374

Make FlutterError objects more structured so they can be displayed better in debugging tools such as Dart DevTools.

* Re-enable const

* Check for invalid elevation usage in the layer tree

* some space formattings

* always use blocks in if-else if a block is used

* format spaces in for and while

* allow multiline if conditions

* fix missing space

* fix indentof statements in BlockFunctionBody

* fix indentof statements in BlockFunctionBody in tests

* add trailing commas on list/map/parameters

* add trailing commas on Invocation with nb of arg>1

* add commas for widget containing widgets

* add trailing commas if instantiation contains trailing comma

* revert bad change

Before this, we had several places where an isReleaseMode was defined, all with the same definition. This just makes it more broadly visible to allow our users to use it, as well as creating debug and profile versions, and adding a device lab test for it.

Since this is a const value, this makes it possible for a developer to easily mark blocks that can be removed at AOT compile time.

* Remove stray extra space

* Add ImageStreamCompleter.hasListeners (and cleanup)

This is mostly just some cleanup of stuff I ran into, but it makes
`hasListeners` protected on `ImageStreamCompleter`, because otherwise
there's no way to track if listeners are registered or not.

* Address review comments

* fix some bad indentations

* remove suspicious line

* Add didSendFirstFrameEvent service extension.

* Switch over to the new name for compilation trace native function.

Also see: https://github.com/flutter/engine/pull/7256

* rename

* roll the engine