Linux: Reduce resource usage when the window is minimized (issue #1369).

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef3@1832 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
Change automate-git.py to use a Git checkout of depot_tools (issue #1376).

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef3@1834 5089003a-bbd8-11dd-ad1f-f1f9622dbc98