* 982e1ca54 [path_provider] Migrate examples to null-safety (flutter/plugins#3559)

* e8b38f6e0 [image_picker_for_web] Add doc comments to point out that some arguments aren't supported on the web (flutter/plugins#3566)

* 849f25818 [google_maps_flutter] Migrate to NNBD (flutter/plugins#3548)

* 231553133 [url_launcher] Bump platform interface package to stable NNBD (flutter/plugins#3570)

* 0638189d6 [in_app_purchase]  Migrate to NNBD (flutter/plugins#3555)

* 6c10217bb [path_provider] Bump platform interface package to stable NNBD (flutter/plugins#3568)

* 51c6eac1a [flutter_plugin_android_lifecycle] Bump version for NNBD stable (flutter/plugins#3569)

* 72cbcacfe [package_info] Bump version for NNBD stable (flutter/plugins#3571)

* 4f31f3fa6 [image_picker_platform_interface] Bump NNBD version to stable (flutter/plugins#3573)

* 5817241b8 [flutter_plugin_android_lifecycle-sdk] Update Flutter SDK constraint

* 8e3893502 [path_provider] Bump platform packages to NNBD stable (flutter/plugins#3575)

* f6c2ed4f3 [image_picker] use nnbd version of deps to resolve ci failure (flutter/plugins#3580)

Revert "Reland "Roll Engine from 6993cb229b99 to c217d9d06e4f (60 revisions) (#76352)" (#76394)" (#76403)

This reverts commit 562f53bf.

This reverts commit c310717a.

Also update Gallery to a version that is compatible with this roll.

Added the ability to bring up the date picker dialogs in calendar or text input only modes that don't allow the user to switch. (#76343)

This reverts commit bb3e64da.