[7u10] Request for approval: 7172187 [macosx] JAWT native CALayer not positioned over Canvas

[Sergey Bylokhov]

Hi Everyone,
This is a direct back port from jdk 8 to jdk 7u10.
Bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7172187
Webrev can be found at: http://cr.openjdk.java.net/~serb/7172187/webrev.00
jdk8 changeset: http://hg.openjdk.java.net/jdk8/awt/jdk/rev/65d874d16d59
Technical review: 
http://mail.openjdk.java.net/pipermail/awt-dev/2012-September/003481.html
Reviewers: Anthony Petrov

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Best regards, Sergey.