This patch adds a couple print statements to explain why the first run of
`flutter start` takes a while. (We need to download the APK and install it on
the device.)

This patch improves the error handling for several arbitrary issues I
encountered while experimenting with the tool this evening.

This patch makes `flutter start` work without a clone of the engine git
repository. Making this work pulled a relatively large refactor of how the
commands interact with application packages and devices. Now commands that want
to interact with application packages or devices inherit from a common base
class that holds stores of those objects as members.

In production, the commands download and connect to devices based on the build
configuration stored on the FlutterCommandRunner. In testing, these fields are
used to mock out the real application package and devices.

Also fixes some minor bugs with iOS and Android interactions.

The --install command isn't needed anymore. We automatically detect when
we need to install the APK.

Expose the main entry point for the tools via the library lets us run the tools
from the Flutter package, which simplifies the setup for end developers because
they don't need to declare a dependency on sky_tools directly.

Move Command subclasses into commands directory

Changing Desc to match Github Desc.

I'm trying to get a feel for the code by writing some simple cleanup patches.

Get iOS devices working on Mac if you specify sky-src-path.

Fix Flutter project template

Add implementation of start and stop commands for iOS.

Don’t give a scary error about not being able to run on Android if there’s no Android device connected.

Forward additionalArgs in run_mojo.dart

Just log, don’t exit when the user is missing access to a command. Prevents inappropriately-failing tests.

Just log, don’t exit when the user is missing access to a command. Prevents inappropriately-failing tests.

Beginning implementation of IOSDevice. Implements list and install.

In 0.0.15, additional cmdline arguments were not dropped, but now in 0.0.16, the arguments are no longer forwarded.
This patchset would restore this forwarding functionality.

For example, the following command is intended to pass `enable-multiprocess` to the mojo_shell.
`enable-multiprocess` in 0.0.16 does not get passed along, but this patchset would allow it to once again.

pub run sky_tools -v --very-verbose run_mojo \
	--mojo-path $MOJO_DIR/src \
	--app app.flx --android \
	-- \
	--enable-multiprocess

Also update tests to be compatible with the presence of iOS and add tests for list and install.