[Merge] lp:~fourdollars/ubuntu/trusty/clutter-gtk/1401376 into lp:ubuntu/trusty/clutter-gtk

[Shih-Yuan Lee]

The 3rd patch is because the current clutter in Ubuntu 14.04 doesn't have the full support for scale factor.
So we need a little hacking.
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https://code.launchpad.net/~fourdollars/ubuntu/trusty/clutter-gtk/1401376/+merge/244380
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