Add a method to set up /proc/cpuinfo with enough privileges. Set
up the environment for an app in InitializeNativeBridge().
Turn on -Wall for libnativebridge.
(cherry picked from commit 962eb40abb)
(cherry picked from commit ab0da5a9a6)
(cherry picked from commit 2f71cb24fa)
(cherry picked from commit 04054e28e2)
(cherry picked from commit 4390a63236)
Bug: 17671501
Change-Id: Id4f4127d82737b5e56a77175e1068ff5cea60f9d
