iOS builds rely on package dependencies and associated build artifacts
(pubspec.lock, .packages files) to be up-to-date.

Artifacts are now located in a central place.
This will enable us to downlaod artifacts when we need them (instead of
downloading them all upfront).
This also makes replacing sky_snapshot with gen_snapshot easier.

* improve the logger ui a bit for elapsed times

* invert param

* update daemon.dart

Add a user friendly error message when no development team is selected for physical deployment (#7879)

* Remove the workaround that pinned args to v0.13.6
This reverts most of the changes in commit 6331b6c8
* throw exception if exit code is not an integer
* rework command infrastructure to throw ToolExit when non-zero exitCode
* convert commands to return Future<Null>
* cleanup remaining commands to use throwToolExit for non-zero exit code
* remove isUnusual exception message
* add type annotations for updated args package

* convert pubGet to throw ToolExit on non-zero exit code
* convert commandValidator to throw ToolExit for non-zero exit code
* convert flutter commands to throw ToolExit for non-zero exit code
* use convenience method throwToolExit
* only show "if this problem persists" for unusual exceptions

* make showElapsedTime default to true

* support nested progresses

* improve hot reload message

* rethrow

Fixes https://github.com/flutter/flutter/issues/5775

* refactor _run to runCmd

* replace requiresProjectRoot getter with call to commandValidator

* replace requiresDevice getter with call to findTargetDevice

* trace command requires a debug connection, not a device

* inline androidOnly getter

* rename command methods to verifyTheRunCmd and runCmd

* move common verification into BuildSubCommand

* rename deviceForCommand to device

* rename methods to verifyThenRunCommand and runCommand

* This reverts commit 5e7e7b6e.

* default to lib/main.dart

This reverts commit 32ad81c8.

Fixes #4298

* show build progress; print app sizes

* add todo

* review comments

* remove unused import

Currently only android-arm and ios are supported target platforms.

Wire up ios-profile and ios-release. Switching between debug, profile and release starts the build process from scratch. (#4063)

Artifacts from local engine builds will be found based on the --local-engine flag

* download android-arm-deploy

* wire up --deploy to android-arm-deploy

* fix interpolation

* use the new cache code to locate more artifacts

* add todo

* review comments

Fix some legit uses of GlobalKey to specify the type they want.



Fix some sketchy uses of GlobalKey in tests to fake it with "as

dynamic".



Remove some extraneous imports that made the build red.

Add a `--no-codesign` option to `ios build` to disable code signing.

This allows the user to build an iOS application bundle from the command line even if no device is attached to the workstation.