IDL compiler: 3 more special types for methods

3 last special types:
* CompareHow
* Dictionary
* MediaQueryListListener
Only Dictionary involves a new block of code; others are just type handling.

Also a bit of cleaning up of type code and test categories.

BUG=239771
NOTRY=true

Review URL: https://codereview.chromium.org/52353003

git-svn-id: svn://svn.chromium.org/blink/trunk@160994 bbb929c8-8fbe-4397-9dbb-9b2b20218538