Force request context to initialize beforing incepting protocol

More fixes of Tray

Delay the call of element resize callback to next tick

Upload node headers with new filenames

Fixed typo

Add a comment to build instructions about cpplint

I added a mention of `cpplint.py` in the build instructions.
The reason, is because it's easy to miss it's existence. Even if you
noticed it's mentioned in `coding-style.md` you might mistakenly think
that `test.py` runs it).

Make sure microtask checkpoint is performed after Node.js calls

This follows the behavior of Node.js.

Clean up NativeWindow code, phase 2