Initial implementation of the permission API for Browser Plugin PointerLock
Exposed permission event parameters:
userGesture - true if the lock request originated from a user gesture.
lastUnlockedBySelf - true if the a previous mouse lock to the page was unlocked by the page itself (i.e. not through a user alt+tabbing out).
originUrl - the URL of the page the request originated from.
BUG=166228
Review URL: https://chromiumcodereview.appspot.com/
12455011
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@187221 0039d316-1c4b-4281-b951-d872f2087c98