TBR=abarth@google.com

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.

R=abarth@google.com

Previously --simulator required an argument due to not having
an action specified and defaulting to "store" instead of "store_true"

R=iansf@google.com

This patch updates big_red_button to release the artifacts produced from the
|dist| target in ninja.

... and move instructions to the wiki.

This program just creates a snapshot, not the whole package.

Currently crashes with a python exception due to typo.

R=abarth@google.com

This code isn't referenced anymore.

- angle
- boringssl
- smhasher
- cython

Remove these dependencies required stripping down some BUILD.gn files to remove
targets we don't build.

Also, stop pushing the SDK to sky_sdk now that this repo exists.

Previously, we were using too many parallel instances of $CXX, which caused
crashes. Now we use -j 2, which seems to work. Also, use fewer processes during
testing.

There are actually two uses cases for symlink.py. This CL restores
//build/symlink.py to match the version in Chromium and adds a new version in
////sky/build/symlink.py that works properly for the material-design-icons.

- Add missing dependencies caught by gn's new stricter checker
- Update opentype code to use new OTS API. This code is updated from HEAD
  Blink.
- Add base dependency to wtf to avoid redefining marcos from base/macros.h
- Update callers of various base string utility functions to use base
  namespace.

Typo from a previous commit of mine.

R=abarth@google.com

R=abarth@google.com

R=abarth@google.com

Also fixed a typo in big_red_button script where
we were passing 'gn' to the 'gn' script.

R=abarth@google.com

R=abarth@google.com

Also fixed roll_versions to no longer roll mojo paths
since those are not part of the sky_engine repository.

R=abarth@google.com

This lets us avoid using mojob.py, which errors out because we lack a go
toolchain.