Add WebIDL and Pepper compliant lexer/parser tool.

Add WebIDL and Pepper compliant lexer/parser tool.

This CL is the first step towards supporting automatic doc
generation. This lexer more closely follows the WebIDL
spec.

Please review idl_node, idl_parser, idl_node
idl_log.py is unchanged from the original

This is a complete re-write of the original lexer/parser, as well as simplifications to IDLNode.

All *.in and *.idl files are for test purposes only.

To test: python idl_lexer.py OR python idl_parser.py

NOTRY=true
R=sehr@chromium.org
BUG=224150

Review URL: https://codereview.chromium.org/13498002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@193973 0039d316-1c4b-4281-b951-d872f2087c98