Make Mac plugin window interposing more conservative about activating plugin
Make Mac plugin window interposing more conservative about activating plugin

Don't switch to the plugin process for offscreen windows (like the one opened by Unity).

BUG=38996
TEST=Open a Unity sample. It shouldn't lose focus on every mouse event (although it will still lose focus once).

Review URL: http://codereview.chromium.org/1626002

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@43716 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser