* Add DisplayFeatures and DisplayCutout to viewport metrics

* WindowManager alpha03 and better documentation

* Fixed formatting

* Fixed failing tests

* Replaced API version code P with 28

* Unnecessary import

* Fixed display features parameters missing

* Documentation changes

* First paragraph is a sentence

* Update androidx window library to version 1.0.0-alpha05

* Improve documentation, remove deprecated display feature call

* Write tests and improve documentation

* Migrate to Window Manager alpha08

* Update androidx window to beta01

* Remove unused import

* Remove window_hook_integration_test.dart

* Fix tests

* Update android_embedding_dependencies version to include androidx.window

* Add androidx.window to test_runner build

* Add empty display features arrays to fuchsia platform view

* Fix tests using final class mocking

* Add missing license header

* Update licenses_golden

This reverts commit bffec2a6.

response is being interpreted as `null` in dart. This results in a
MissingPluginException being thrown whenever `View.update` or
`View.dispose` is invoked.

This change returns null data in a dictionary to complete the response
in a way that is not interpreted as `null` in dart.

Co-authored-by: Aaron Clarke <gaaclarke>

merge accounting of the (mutually exclusive) picture and dl cache entries in reported statistics (#28392)