Shared namespaces are used for bundled app classloaders.
Bug: http://b/22548808
Bug: http://b/26165097
Change-Id: I163033f70c50ef9ddb4164676c033ab30748964e
(cherry picked from commit ef4639c1a5)
Extracted native loader to separate library in order to
be able to reuse it for NativeActivities related native code
in libandroid_runtime.so
Bug: http://b/22548808
Change-Id: Ibcf5ddcdc5aba22e32e4b72887840e9c171c1986