Add UseCounter for input[type=email][multiple], input[type=email][maxlength], and input[type=email][multiple][maxlength].

We're discussing removal of maxlength support for type=email.
https://www.w3.org/Bugs/Public/show_bug.cgi?id=23573

BUG=none
TEST=none; no behavior changes.
R=ksakamoto@chromium.org

Review URL: https://codereview.chromium.org/42693003

git-svn-id: svn://svn.chromium.org/blink/trunk@160513 bbb929c8-8fbe-4397-9dbb-9b2b20218538