Adding "teleport windows to user X" context menu

This adds the teleport items to the context menu. At the same time I was also adding a GetUserID function to the SessionStateController to avoid adding the sanitization of the user names all over the place.

BUG=306143
TEST=visual, a few things got handled by unit tests

Review URL: https://codereview.chromium.org/27217003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229607 0039d316-1c4b-4281-b951-d872f2087c98
20 files changed