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Currently when we switch between displays with extended displays turned on, the sequence is,
Mirrored -> Extended -> Extended (reversed) -> Mirrorer.

Change this to switch only between extended and mirrored displays if the extended display flag is enabled,
i.e.,
Mirrorer -> Extended -> Mirrored.


R=oshima@chromium.org
BUG=137727
TEST=Tested on a ChromeOS device with a secondary display to confirm that the inteded sequence is followed on switching displays.


Review URL: https://chromiumcodereview.appspot.com/10829026

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148842 0039d316-1c4b-4281-b951-d872f2087c98