am 1f7c3cb3: am 061c758c: am 9fdf671d: Add LOCAL_ADDITIONAL_HTML_DIR to clear_vars for devsite docs builds.

# Via Android Git Automerger (2) and Dirk Dougherty (1)
* commit '1f7c3cb3c2b475903c7616bf3f5b06530420cd94':
  Add LOCAL_ADDITIONAL_HTML_DIR to clear_vars for devsite docs builds.