Enables Activity Logger to log extension adding the following elements to the DOM:
- script
- link
- anchor
- iframe
- form
- input
- button

BUG=388287

Review URL: https://codereview.chromium.org/349263002

git-svn-id: svn://svn.chromium.org/blink/trunk@177105 bbb929c8-8fbe-4397-9dbb-9b2b20218538