Re-apply "Send nextId in addition to previousId for traversal order" (f…

…lutter#14694)

Re-apply "Send nextId in addition to previousId for traversal order (flutter#14676)"

ScaffoldGeometry plumbing. (flutter#14580)

Adds a ScaffoldGeometry class and ValueNotifier for it.
A scaffold's ScaffoldGeometry notifier is held in the _ScaffoldState, and is passed to _ScaffoldScope.
New ScaffoldGemometry objects are built and published to the notifier.

Add annotations to ignore analyzer errors on pre-dev.22 SDKs (flutter…

…#14599)

Revert kRadialReactionRadius was 20 is now 24 again (flutter#14522)

Let Travis build the gallery and push to TestFlight / Play Store (flu…

…tter#14408)

* iOS works

* Works on Android

* Take in commit number in iOS also. Get rid of image upload for Android. It's just a waste of bandwidth

* Tweak to fix on Travis

Try to make transitioning channels actually work. (flutter#14353)

* Try to make transitioning channels actually work.

* Update upgrade.dart

import all generated files in animated_icons_private_test (flutter#14329

)

Rolling alpha to 0.0.20 (flutter#13511)

Release 0.0.19 (flutter#13365)

Add EdgeInsets, MediaQuery support for view insets (flutter#13272)

* Add MediaQuery support for view insets

Also updates EdgeInsets documentation to reflect WindowPadding's use for
both padding and view insets.

See engine commits:
  flutter/engine#4403
  flutter/engine#4406