Request for approval: 4991647: PNGMetadata.getAsTree() sets bitDepth to invalid value

[mikhail cherkasov]

Hello,

I need an approve for backport from jdk9/8 to jdk7u-dev. The backport is 
absolutely the same as original fix for jdk9/8.

bug: https://bugs.openjdk.java.net/browse/JDK-4991647

changeset:
9:
http://hg.openjdk.java.net/jdk9/client/jdk/rev/6c875efda606
8:
http://hg.openjdk.java.net/jdk8u/jdk8u-dev/jdk/rev/13b037e45bce

webrev:
http://cr.openjdk.java.net/~mcherkas/8041460/webrev.04/

review:
http://mail.openjdk.java.net/pipermail/2d-dev/2014-June/004634.html
http://mail.openjdk.java.net/pipermail/2d-dev/2014-July/004664.html

Thanks,
Mikhail.