New item dialog for fitness app and other minor improvements

R=eseidel

Teach skyx where the material design icons are

Add back some DEPS

clarify what is currently supported

Turns out if we don't have these deps, nothing builds these packages.

TBR=abarth@google.com

This script is unused.

Remove the magic from the Sky package

Make it possible to specify which sky app and sky server to use from the command line, overridding the Info.plist.

We now just symlink the lib directory into the packages directory in the output
directory.

Sky app in the simulator.

Symlink Material Design Icons into Dart packages in the out dir

Otherwise they won't be visible to the web server.

Remove outdated HACKING.md document

CONTRIBUTING.md has the current instructions.

Add sky_services pub package

This script was erroring out due to some missing renames.

This package contains the mojom.dart files we generate from the sky_engine
repository.

Move Material Design Icons to their own package

After this patch, we use pub to manage versioning and fetching the material
design icons.

Adds test case for drawAtlas in games

Fix sky/tools/gn --ios --simulator to set the correct target_cpu

Also fixed missing dependency from LocalDOMWindow.cpp on
mojo's navigation service.  Not sure why gn check missed that.

R=abarth@google.com

Add a dialog to the address book app to test scoped focus.

Add a sky_engine package to contain the dart:sky SDK extensions

Create a SkyShell.apk

Adds custom play button with texture to demo game

Fix sky/tools/gn to not crash

TBR=abarth@google.com

Remove scheduleBuild()

This CL introduces a SkyShell.apk that is separate from the SkyDemo.apk that we
upload to the store to show our demos.  The SkyShell.apk is just an empty shell
that can run Sky applications on Android.

Fix gn --ios --simulator to use the right out directory.

R=abarth@google.com