* remove obsolete check

* FML_DCHECK flutter_view_ in methods that actually use it

Before this change, when we encounter an unhandles exception,
we see:

```
[00050.147083][37665][67367][klog] ERROR: [ERROR:flutter/shell/common/shell.cc(209)] Dart Error: Unhandled exception:
[00050.147087][37665][67367][klog] INFO: UnimplementedError
```

This doesn't help identify the root cause. Adding stack trace will help
the cause.

* Move CkCanvas to new JS-interop
* Make SkiaObject compatible with JS-interop; text bindings
* fix drawVertices

* Makes IOS dispatchs showOnCcreen action for header semantics nodes

* update

* format

* Re-enable logging.

fuchsia_ctl was updated to support processing the logs as a stream
instead of keeping them in the process.

Bug:
  flutter/flutter#57273

* Add path to logs file.

* Add the isolated output env directly to the script.

* Save log to local directory and printing it using cat.

* Try collecting and printing logs as separate steps.

Adds new package:sse dependency

1e78bd069e [ package:dds ] Add missing package:shelf_static dependency in pubspec.yaml
51d3fae7d3 Revert "Move `BytesBuilder` class and implementation to `dart:typed_data`."
e7b319698d [ package:dds ] Add server-sent event (SSE) support to DDS
d4ac7066b7 Improve diagnostic message when short circuiting (issue 42599)
7960ad545a [ Service ] Fix line numbers in step_through_mixin_from_sdk_test
505fca1ce5 [ package:dds ] Fix issue where StateError could be thrown if DDS shuts down with in-flight requests
47b080de23 [vm/nnbd] Do not check if NNBD experimental flag is enabled for non-null assertions
ef147c0a95 Issue 42699. Stop reporting EXPORT_DUPLICATED_LIBRARY_NAMED and IMPORT_DUPLICATED_LIBRARY_NAMED.
0cc2d9685a [vm] Fix --use-bare-instructions=false on simarm_x64.
6fc75e6a2b [vm] Add tests and packages to the Fuchsia package
a2edb7976c Make CiderCacheEntry public.
4726b1b337 [infra] Update Chrome used in testing to version 84

* Support all system cursors in WIn, Linux, mac, Web and Android.

Work towards flutter/flutter#60999

All usage of .packages must eventually be replace with package_config.json to support language versioning.

Work towards flutter/flutter#60999

All dart compilations must eventually use package-config, since this contains the language versions. Update all of the web_sdk rules.