DevTools: count the number of consoleProfile and consoleTimeline calls.

We would like to know stats about consoleProfile and consoleTimeline
usage in the field. If they are small we would like to deprecate and remove these commands.

BUG=

Review URL: https://codereview.chromium.org/436873002

git-svn-id: svn://svn.chromium.org/blink/trunk@179400 bbb929c8-8fbe-4397-9dbb-9b2b20218538