Count Promise constructor callings.

Promise API is changing (See [1], [2] for details).
Count how Promise constructor functions are called.

[1] https://mail.mozilla.org/pipermail/es-discuss/2014-January/035976.html
[2] https://mail.mozilla.org/pipermail/es-discuss/2014-February/036193.html
BUG=343815
R=tkent, haraken

Review URL: https://codereview.chromium.org/166173002

git-svn-id: svn://svn.chromium.org/blink/trunk@167206 bbb929c8-8fbe-4397-9dbb-9b2b20218538