Add tests for several Stagefright-related issues

This work constitutes a port from Zimperium's Stagefright Detector
app into AOSP. It's implemented in two parts:

1. Java code that handles extracting raw resources and calls JNI.
2. JNI code that uses libstagefright to process various
proof-of-concept files that cause a crash.

The proof-of-concept files are included in the android.security
package's raw resources.

Change-Id: Ifce433da1698cf84b167f5d29c2032627aa2076e
16 files changed