[webview_flutter] Add loadRequest functionality to app facing package. (#4573)

* Add android implementations for loadRequest.

* Update changelog and pubspec.

* Fix comment.

* Fix comment.

* Add tests

* Add back removed license headers

* Fix analysis error

* Add support for loadRequest to app facing package

* Add test

* Comment pending dependency in pubspec

* Remove workaround for supporting custom headers when making post requests on Android.

* Document android workaround in dart doc

* Enforce uri scheme

* Update loadRequest dartdoc

* Document android workaround in readme

* Processed PR feedback.

* Updated dependency, version and changelog.
8 files changed
tree: 6c7409ffd0297e2d3727376b91995babf4fce2a7
  1. packages/