This patch finishes documenting all the symbols except for those related to
scrolling.

* Add a text formatter interface used by EditingText. Provide some default implementations.

* self nits

* Handle -1 selection offsets

* review notes

* simplify regular expression

* Add whitelisting formatters. Use a custom phone number formatter in text demo.

* review notes

* not being able to addAll(null) is pretty annoying

* review notes

* partial tests

* Add tests

* didn’t end up needing mockito

* move to services

Creates another Decoration for drawing outside the decorated box with a gradient to emulate the shadow.

Lets the cupertino transition page's background be transparent.

Fixes #9321

...because it clearly is.

* Implement

* Don’t scale the fractional offsets since it’s easier to use

* review notes

* fix nit

FlutterCommand.runCommand subclasses can optionally return a FlutterCommandResult which is used to append additional analytics. 

Fix flutter run timing report and add a bunch of dimensional data

backgroundColor -> color
backgroundImage -> image
BackgroundImage -> DecorationImage

If the user specified a non-exact device id, it was producing
an exception whereby we were trying to listen to the
`getAllConnectedDevies()` stream twice.

A NestedScrollView lets you implement patterns where you have a header, tabs,
and additional scrollers inside the tabs.

Fixes #8359

Previously, ScrollPosition did not know about ScrollActivities. However, all
the concrete subclasses of ScrollPosition that we know about need to use
ScrollActivities, so they ended up with a bunch of delegate boilerplate code.

This patch teaches ScrollPosition about ScrollActivities but doesn't have any
opinion about how to start or interact with those activities.

This patch is more refactoring to prepare for nested and linked scrolling.

It causes the test to be flaky, see https://github.com/flutter/flutter/issues/8986.

This will make it easier to implement nested scrolling.

* add a regression test for daemon device notification

* revert event send simplification

* Mark channels_integration_test_ios flaky

* Removed personal dev team from ios code siging

* Removed provisioning profile diffs against other samples

Fixes https://github.com/flutter/flutter/issues/7648

* Add a tile scrolling test to complex_layout app

* - Review comments and fix analyzer failures.

* Use ListView.builder pattern.

Fixes #9612

The enum is called StackFit, so the property name "fit" makes more sense.

Note: In a cross-platform context `Uri.path` is not a valid file path. Allways use `fs.path.fromUri` to convert.

Also, add a timeout so a hung `adb` will not cause the
tools process to hang.

Fixes #9567