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.