This change gives sandboxed renderer scripts a similar structure to what already
exists in the lib/{browser,renderer,common} directories.
It also allows sandboxed renderer initialization to share more code with
non-sandboxed renderers (ipcRenderer is now imported directly from
lib/renderer/api/ipc-renderer).
- Adapt node.cc code that implements `process.binding` to create a similar
object in AtomSandboxedRendererClient.
- Replace the ipc binding object passed to `lib/sandboxed_renderer/init.js` by
the new binding object.
- Refactor the initialization script to use this new object to fetch the ipc
binding and store as a hidden value using the `v8_util` module.
This change also required applying a patch to node.js, so the submodule commit
was updated.
Add a gyp target that creates a browserify bundle starting with
`lib/sandboxed_renderer/init.js`, which is embedded into the executable using
the `atom_js2c` target.
The goal of this bundle is to provide a very basic environment for preload
scripts where a `require` function is available.
