GitLab

Wrote proper documentation for PP_VARTYPE_ARRAY and PP_VARTYPE_DICTIONARY. These
previously said that they are not currently supported, but they are.

For PP_VARTYPE_STRING, added note that AddRef and Release must be used.

Review URL: https://chromiumcodereview.appspot.com/23757014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221654 0039d316-1c4b-4281-b951-d872f2087c98