Fix one and hide the other warnings from core/jni

Most of the warnings are unused parameter from skia functions.

Change-Id: I9df57718d117c26b96163f751ccb056ca86ac072
Add GCMParameterSpec to preloaded-classes

Needed for Bouncycastle 1.50 upgrade with art.

Change-Id: I901122c1ce21abba437a7537e70331724c3cbc9c
Merge "Add GCMParameterSpec to preloaded-classes"
Merge "Fix one and hide the other warnings from core/jni"