If there is more than one action, then the AppBar should align the title to the
left according to
<https://material.io/guidelines/platforms/platform-adaptation.html#platform-adaptation-platform-recommendations>

* Populate PUB_ENVIRONMENT for initial pub get

* review comments

* change order

As required by
<https://material.io/guidelines/platforms/platform-adaptation.html#platform-adaptation-platform-recommendations>.

This splits the frame pipeline into two, beginFrame and drawFrame.

As part of making this change I added some debugging hooks that helped
debug the issues that came up:

 * I added debugPrintScheduleFrameStacks which prints a stack whenever
   a frame is actually scheduled, so you can see why frames are being
   scheduled.

 * I added some toString output to EditableText and RawKeyboardListener.

 * I added a scheduler_tester.dart library for scheduler library tests.

 * I changed the test framework to flush microtasks before pumping.

 * Some asserts that had the old string literal form were replaced by
   asserts with messages.

I also fixed a few subtle bugs that this uncovered:

 * setState() now calls `ensureVisualUpdate`, rather than
   `scheduleFrame`. This means that calling it from an
   AnimationController callback does not actually schedule an extra
   redundant frame as it used to.

 * I corrected some documentation.

* Adjust the defaults behaviour of scroll views.

Now, primary scroll views scroll by default. Others only scroll if necessary.

* apply suggested changes

* Revert "Document ScrollController (#9705)"

This reverts commit ff8609f2.

* Revert "Fix channels integration test (#9713)"

This reverts commit aace622d.

* Revert "Fix flutter view project's automated tests (#9712)"

This reverts commit 1a4bf9b6.

* Revert "Update hello_world_memory_test package name (#9704)"

This reverts commit ffa8483f.

* Revert "Increment the flutter package version (#9699)"

This reverts commit 3b237a8c.

* Revert "Don’t pod unless there are plugins (#9701)"

This reverts commit 732f79ee.

Remove checked in .lock, remove checked in cocoapods scripts in xcode project, let the automated test run pod install specifically for this test

Broken by 89af5ec8.

* Add cocoapods reason

* s/native/iOS

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