This is a reland of https://github.com/flutter/flutter/pull/177410
The previous pr was hitting deadlocks with tests that use screenshots.
This reland fixes it by submitting frames asynchronously instead of
synchronously.
This PR fixes https://github.com/flutter/flutter/issues/169147
This is the iOS implementation of
https://github.com/flutter/flutter/issues/149033
In Add-to-App scenarios, a common desired use case is to have the
embedded FlutterView be able to size itself based on it's content. Up
till now, the size had to be manually specified, which can be tedious
and inaccurate.
This PR adds a new flag, `isAutoResizable`, which enables the ability
for the embedded flutter view to dynamically set it's own size based off
it's content. Note that this feature will *NOT* work if the the embedded
app is wrapped in flexible or unsized widgets, such as Scaffold. The
FlutterView will just not display at all.
To use the new flag, just set it like
```
flutterViewController.autoResizable = true;
```
or in Swift
```
flutterViewController.isAutoResizable = true
```
## Pre-launch Checklist
- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.
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