Update Android activities because plugin registration is now done by FlutterActivity.configureFlutterEngine (#50841)

* Update project.pbxproj files to say Flutter rather than Chromium

Also, the templates now have an empty organization so that we don't cause people to give their apps a Flutter copyright.

* Update the copyright notice checker to require a standard notice on all files

* Update copyrights on Dart files. (This was a mechanical commit.)

* Fix weird license headers on Dart files that deviate from our conventions; relicense Shrine.

Some were already marked "The Flutter Authors", not clear why. Their
dates have been normalized. Some were missing the blank line after the
license. Some were randomly different in trivial ways for no apparent
reason (e.g. missing the trailing period).

* Clean up the copyrights in non-Dart files. (Manual edits.)

Also, make sure templates don't have copyrights.

* Fix some more ORGANIZATIONNAMEs

Updated flutter/examples to further conform to new embedding: removed references to FlutterApplication, deleted all MainActivity's that were not necessary, removed all direct invocations of GeneratedPluginRegistrant. (#22529) (#44782)

This reverts commit 99cd4403.

This reverts commit 46edc802.

* Fix device lab tests

* Migrate examples to the Android embedding v2 (#43221)

This reverts commit b49ffa81.

This API requires the UPDATE_DEVICE_STATS permission on KitKat

* Revert "New Flutter Gallery UI (#16936)"

This reverts commit 7038597b.

A new front-end for the Flutter Gallery example.

* android templates should add density and screenLayout to config changes

* update the rest of the manifests

* first round fastlane working on Android

* clean up and start ios

* Partial iOS

* Got a fastfile that works on iOS

* Finalize Android push instructions

* Finalize instructions for iOS

* Extra cleanup and optipng

* Disable readme autogen and add a default readme

* Add framework-side support for system text scale factor.

* Rolling engine to e3404b81a53ba3180c7623a6f2190ebb28518f30
  Additional changes rolled in with engine change:
    libtxt: implementation of GetRectsForRange that processes a line at a time - e3404b8
    Provide an entropy source to the Dart engine (#4161) - e1aa867
    libtxt: search for fallback fonts that can match emoji and CJK characters - 8061df1
    Roll skia to e4679fa06a. (#4157) - 267e7a8
    Update buildroot to 53fea9aebbcc39c6522731471a1a45960ee0685e (#4160) - 02ea7ae
    Revert engine Dart roll. (#4158) - 14aab33
    Add support for system text scale factor. (#4124) - b2a7f4b
    Include _http into sky_engine libraries for analyzer (#4154) - b930f10
    libtxt: Remove postprocess_line and improve tracking of X offsets - 86f95f0
    libtxt: remove redundant line_widths (#4152) - 14bf515
    Roll dart to ade37f931e90b0fdb8fe16d6bf6f089545da55b6 (#4151) - 6f1264f

* add Android instrumentation test

* add devicelab test

* add to manifest.yaml

* rename _smoke_test.dart to _smoketest.dart to prevent flutter test from picking it up

* volatile fields; style fixes

* use ConditionVariable; fix sh script

This reverts commit 4bbf158b.

* Revert "Update reference to url_launcher plugin in Gallery pubspec (#9879)"

This reverts commit 96a04dea.

* Revert "Revert "Revert plugin use in gallery (#9838)" (#9877)"

This reverts commit ede72a80.

This reverts commit 4bbf158b.

* Revert "add Podfile (#9835)"

This reverts commit 74e65675.

* Revert "update ref to url_launcher plugin in Flutter Gallery (#9833)"

This reverts commit 30c49781.

* Revert "Use url_launcher plugin in Flutter Gallery (#9751)"

This reverts commit 02dfd6be.

Enable plugin infra for both iOS and Android post-#9791.

Brings hello_world and flutter_gallery Android code in line with the
corresponding iOS code.