This widget is a start towards replacing PageableList. There are still a number
of features that we'll need to add before this widget can replace PageableList.

IntelliJ seems to really want these files to have these changes.

This allows us, for example, to wait for the slow mode banner to have
been removed from the screen before triggering a screen shot.

Also, tweak Banner a bit so you can set the color and text style.
Also, cache the text painter between paints.

By default, pass status bar taps to the root view controller in
generated Flutter apps. Developers should customise as necesary if they
later create one or more alternate FlutterViewControllers that they'd
like to forward these to.

If the tool is started immediately after a previous run of the tool, then
the most recent log timestamp may come from the previous run's logs.
The new instance of the tool should not print those logs.

This was happening during runs of the microbenchmark script.

- Out of bound days are disabled and untappable
- Out of bounds months can't be navigated to

With this commit `flutter run --release` and `flutter run --profile` is fully supported on Windows.

* fix issue detecting ios-deploy. fix issue matching IntelliJ Ultimate on Mac

* refactor directory navigation code

Added three widgets that interact with Futures and Streams.

Fixes #7788

Fixes https://github.com/flutter/flutter/issues/5066

Add an "s" command to `flutter run` which takes a screenshot.
Make that comment turn off the slow mode banner.

* Add doctor check for Python 'six' module

Required as part of Xcode lldb module. In all likelihood, if we
encounter this situation, the developer is using a custom Python install
(e.g., via MacPorts or Homebrew).

ios-deploy -h/--help returns a non-zero exit code.

Ref: https://developer.apple.com/xcode/

Instead of using mixins and subclasses, we now use a `ScrollPhysics` delegate
to customize the scrolling phyics for Android and iOS. This change will make it
easier to customize the scroll position for paging.

Also emits the version information in flutter doctor output.

ios-deploy > 1.9.0 is required to deploy to iOS devices.

* Return null from VM.mainView if no view exists
* Retry in connectToServiceProtocol if a view is not yet available
* Do not explicitly call exit from the benchmarks - it will not cleanly shut down the engine

The only remaining client of ScrollableGrid (the old version) is Pesto,
which needs AppBar integration.

SliverFill fills the remaining space in the viewport with each box
child. We'll use this sliver as a building block for pageable lists.

This patch removes unnecessary uses of scrollableKey from tests.
Scrollable2 will likely use a different mechanism for identifying
itself, so we want to focus on the uses of scrollableKey that will need
to be addressed in the new implementation.

These functions were previously hidden inside other functions but they
are useful enough to expose directly. Specifically, I plan to use these
when implementing Scrollable2.ensureVisible.

This avoids Xcode complaining at us about unused xcconfig files (for the
time being).

* Update gradle example to support x86 in debug mode.

Changed the Flutter Gradle plugin a bit to better fit in with the
Android build.

Fixes #6136
Fixes #6864
Fixes #7539