Measure usage for Document API removed from DOM4

Measure usage for the following Document API that was removed from DOM4:
- createCDATASection()
- createAttribute()
- createAttributeNS()
- inputEncoding
- xmlEncoding
- xmlVersion
- xmlStandalone

This will help us determine if they can be deprecated or if they should
be reintroduced in DOM4.

R=arv
BUG=272119

Review URL: https://chromiumcodereview.appspot.com/22794004

git-svn-id: svn://svn.chromium.org/blink/trunk@156029 bbb929c8-8fbe-4397-9dbb-9b2b20218538