Implement VM.getNanoTimeAdjustment(long)

The method signature in VM.java and function declaration
of JVM_GetNanoTimeAdjustment in jvm.h come from the upstream.

JVM_GetNanoTimeAdjustment() is implemented separately in libopenjdkjvm.

Bug: 180577079
Test: m droid
Change-Id: I15e8edbf1b0f26a71ad3641063e55c26566c3473
5 files changed