PackageManager#registerDexModule() allows apps which can call
system apis to register a dex module with the Package Manager.
The PM may optimize the modules on the spot if needed. This is
particular useful for shared dex modules (e.g. chimera modules)
which are loaded in multiple processes.
Test: adb shell am instrument -e class
'android.content.pm.PackageManagerTests' -w
'com.android.frameworks.coretests/android.support.test.runner.AndroidJUnitRunner'
Bug: 37290820
Change-Id: I9ea8f937a76d2549a29e90a6c84c53c2e44a1ee4
3d2af7f72a