Reduce locking in browser and frame implementations to avoid potential deadlocks (issue #824).

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk@1265 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
Mac: Improve scroll event handling for the cefclient OSR example (issue #982).

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk@1267 5089003a-bbd8-11dd-ad1f-f1f9622dbc98