Notification : Fix app info long-press

Addresses http://code.google.com/p/cyanogenmod/issues/detail?id=7060

Change-Id: I45c0e1b73c08ceffef02db244b947bfcedf3b20a
Fix one and hide the other warnings from core/jni

Most of the warnings are unused parameter from skia functions.
Cherry-picked from AOSP:https://android-review.googlesource.com/#/c/72224/

Change-Id: I9df57718d117c26b96163f751ccb056ca86ac072