Mac: Add "Show Tab Overview" menu item.
xib changes: Add menu item with shortcut cmd-f10 for now, connect it to -commandDispatch:. Connect app controller's new outlet to the new menu item.
BUG=50307
TEST=No changes by default. If --enable-expose-for-tabs is passed, a new menu item should be visible below "prev tab" in the window menu. It should be active for normal browser windows and fullscreen windows, but not if there are no browser windows around or if the current window is a popup window or a non-browser window (e.g. prefs). Clicking the menu item doesn't do anything yet. cmd-f10 should trigger the menu item, but it shouldn't if the cmdline flag isn't passed.
TEST2=Go to a page that is busy spinning some javascript (e.g. "javascript:while(1);"), give it focus, hit cmd-f10. Menu should blink immediately.
Review URL: http://codereview.chromium.org/3020035
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@53833 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed
