[7u6] Review request for 7124244: [macosx] Shaped windows support

[Sergey Bylokhov]

Hi Everyone,
Please review the fix. This is a direct backport from JDK 8 to 7u6.

Bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7124244
Webrev can be found at: http://cr.openjdk.java.net/~serb/7124244/webrev.04/
jdk8 changeset: http://hg.openjdk.java.net/jdk8/awt/jdk/rev/f1a90ee31b38

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Best regards, Sergey.