Harry Terkelsen 6911a1513c

Allow sending platform messages from plugins to the framework and implement EventChannel (#40638) ...

* Allow sending messages from the platform to the framework

* Add ability to send messages from the plugin to the platform.

Also adds [PluginEventChannel] which is the plugin counterpart to
EventChannel.

Fixes https://github.com/flutter/flutter/issues/39981

* fix analyzer errors

* Enhance doc comments

* Remove dead code in test

2019-09-19 10:48:57 -07:00

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plugin_event_channel_test.dart

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plugin_registry_test.dart

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