Mac fullscreen mode (with pkasting).

TEST=Launch Chrome.  Create a 2nd tab.  Close bookmark bar.
Cmd-F11 to enter fullscreen; make sure content is centered and both
  bookmark bar and toolbar are gone.  Make sure menubar gone.
Cmd-Opt-arrows to switch tabs; make sure still OK.
Cmd-F11 to go back; make sure things look normal.
Open bookmark bar.
Cmd-F11; make sure gone.  Cmd-F11 again; make sure it comes back.
Confirm View-->Fullscreen menu item works.
While in fullscreen, Cmd-T to create new tab and click on a fav tile.
  Make sure page loads.
While in fullscreen, try window hotkeys (Cmd-N and Cmd-W) to make sure
  they work.  Cmd-` to switch windows; switch back, then Cmd-F11 to
  undo fullscreen.
Move the mouse to to the top of the screen; make sure menubar appears.
Move the mouse down; make sure menubar goes away.


Review URL: http://codereview.chromium.org/126294

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@19559 0039d316-1c4b-4281-b951-d872f2087c98