GitLab

Include sequence number in RootWindow's name so that we can tell in which root window a window is in.

BUG=none
TEST=none

Review URL: https://chromiumcodereview.appspot.com/11825015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@175908 0039d316-1c4b-4281-b951-d872f2087c98