Proposed patch: further wrapping of FileInputStream's native method

[Chan, Sunny]

Previously in JDK-8054720<http://bugs.java.com/view_bug.do?bug_id=8054720>, a number of native methods has been wrapped in order to allow instrumentation. We would like to propose to wrap a number of other methods (available(), skip()) so that we can perform further instrumentation.

I have attached the patch with this email for review.

Sunny Chan
Executive Director
Technology

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