Request for review: 7124552 [macosx] NullPointerException in getBufferStrategy()

[Sergey Bylokhov]

Hi Everyone,
This is the first implementation for canvas backbuffer. npe was eliminated.

Bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7124552
Webrev can be found at: http://cr.openjdk.java.net/~serb/7124552/webrev.00/

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Best regards, Sergey.