[Nexus 6 Developer Discussion [Developers Only]] dankoman:
is GooglePackageInstaller needed for something? it's in system/priv-app of shamu 6.0 factory image. here's aapt badging dump:

package: name='com.google.android.packageinstaller' versionCode='23' versionName
='6.0-2256973'
sdkVersion:'23'
targetSdkVersion:'23'
original-package:'com.android.packageinstaller'
uses-permission:'android.permission.INSTALL_PACKAGES'
uses-permission:'android.permission.DELETE_PACKAGES'
uses-permission:'android.permission.CLEAR_APP_CACHE'
uses-permission:'android.permission.CLEAR_APP_USER_DATA'
uses-permission:'android.permission.READ_EXTERNAL_STORAGE'
uses-permission:'android.permission.MANAGE_USERS'
uses-permission:'android.permission.GRANT_RUNTIME_PERMISSIONS'
uses-permission:'android.permission.REVOKE_RUNTIME_PERMISSIONS'
uses-permission:'android.permission.INSTALL_GRANT_RUNTIME_PERMISSIONS'
uses-permission:'android.permission.INTERACT_ACROSS_USERS_FULL'
uses-permission:'android.permission.READ_INSTALL_SESSIONS'
uses-permission:'android.permission.UPDATE_APP_OPS_STATS'
uses-permission:'android.permission.KILL_UID'
application-label:'Package installer'
application-label-ca:'Instal┬╖lador de paquets'
application-label-da:'Pakkeinstallationsprogram'
application-label-fa:'┘å╪╡╪¿ ┌⌐┘å┘å╪»┘ç ╪¿╪│╪¬┘ç'
application-label-ja:'πâæπââπé▒πâ╝πé╕πéñπâ│πé╣πâêπâ╝πâ⌐'
application-label-nb:'Pakkeinstallasjon'
application-label-de:'Paket-Installer'
application-label-af:'Pakketinstalleerder'
application-label-bg:'╨ÿ╨╜╤ü╤é╨░╨╗╨╕╤Ç╨░╤ë╨░ ╨┐╤Ç╨╛╨│╤Ç╨░╨╝╨░ ╨╖╨░ ╨┐╨░╨║╨╡╤é╨╕'

application-label-th:'α╣éα╕¢α╕úα╣üα╕üα╕úα╕íα╕òα╕┤α╕öα╕òα╕▒α╣ëα╕çα╣üα╕₧α╣çα╕üα╣Çα
╕üα╕ê'
application-label-fi:'Paketin asentaja'
application-label-hi:'αñ¬αÑêαñòαÑçαñ£ αñçαñéαñ╕αÑìΓÇìαñƒαÑëαñ▓αñ░'
application-label-vi:'Tr├¼nh c├ái ─æß║╖t g├│i'
application-label-sk:'N├ístroj na in┼ítal├íciu bal├¡─ìkov'
application-label-uk:'╨ƒ╤Ç╨╛╨│╤Ç╨░╨╝╨░ ╨▓╤ü╤é╨░╨╜╨╛╨▓╨╗╨╡╨╜╨╜╤Å ╨┐╨░╨║╨╡╤é╨░'
application-label-el:'╬á╧ü╧î╬│╧ü╬▒╬╝╬╝╬▒ ╬╡╬│╬║╬▒╧ä╬¼╧â╧ä╬▒╧â╬╖╧é ╧Ç╬▒╬║╬¡╧ä╬┐╧à
'
application-label-nl:'Installatieprogramma van pakket'
application-label-pl:'Instalator pakietu'
application-label-sl:'Namestitveno orodje za paket'
application-label-tl:'Installer ng package'
application-label-am:'ßîÑßëàßêì ßî½ßè¥'
application-label-in:'Pemasang paket'
application-label-ko:'φî¿φéñ∞ºÇ ∞äñ∞╣ÿ φöäδí£Ω╖╕δ₧¿'
application-label-ro:'Program de instalare a pachetelor'
application-label-ar:'╪ú╪»╪º╪⌐ ╪¬╪½╪¿┘è╪¬ ╪º┘ä╪¡╪▓┘à'
application-label-fr:'Programme d'installation du kit'
application-label-hr:'Alat za instaliranje paketa'
application-label-sr:'╨ú╨┐╨░╨║╨╛╨▓╨░╨╜╨╕ ╨┐╤Ç╨╛╨│╤Ç╨░╨╝ ╨╖╨░ ╨╕╨╜╤ü╤é╨░╨╗╨░╤å╨╕╤
ÿ╤â'
application-label-tr:'Paket y├╝kleyici'
application-label-cs:'N├ístroj k instalaci bal├¡─ìk┼»'
application-label-es:'Instalador de paquetes'
application-label-it:'Installazione pacchetti'
application-label-lt:'Paketo ─»diegimo programa'
application-label-pt:'Instalador do pacote'
application-label-hu:'Csomagtelep├¡t┼æ'
application-label-ru:'╨ƒ╤Ç╨╛╨│╤Ç╨░╨╝╨╝╨░ ╤â╤ü╤é╨░╨╜╨╛╨▓╨║╨╕ ╨┐╨░╨║╨╡╤é╨░'
application-label-zu:'Isifaki sephakheji'
application-label-lv:'Pakotnes instal─ô┼íanas programma'
application-label-sv:'Installationsprogram f├╢r paket'
application-label-iw:'╫₧╫¬╫º╫Ö╫ƒ ╫ö╫ù╫æ╫Ö╫£╫ö'
application-label-sw:'Kisakinishaji cha furushi'
application-label-fr-CA:'Programme d'installation de la trousse'
application-label-lo-LA:'α╗éα║òα║òα║┤α║öα║òα║▒α╗ëα║çα╗üα║₧α║▒α║üα╗Çα║üα║ö'
application-label-en-XA:'[├₧├Ñ├º─╖├Ñ─¥├⌐ ├«├▒┼í┼ú├Ñ─╝─╝├⌐┼ò one two three]'
application-label-en-GB:'Package installer'
application-label-ar-XB:'ΓÇÅΓÇ«PackageΓÇ¼ΓÇÅ ΓÇÅΓÇ«installerΓÇ¼ΓÇÅ'
application-label-bn-BD:'αª¬αºìαª»αª╛αªòαºçαª£ αªçαª¿αª╕αºìαªƒαª▓αª╛αª░'
application-label-et-EE:'Paketiinstaller'
application-label-ka-GE:'ßâ₧ßâÉßâÖßâößâóßâÿßâí ßâÿßâ£ßâíßâóßâÉßâÜßâößâáßâÿ'
application-label-ky-KG:'╨ó╨╛╨┐╤é╨╛╨╝ ╨╛╤Ç╨╜╨╛╤é╨║╤â╤ç'
application-label-km-KH:'ß₧Çß₧ÿßƒÆß₧ÿß₧£ß₧╖ß₧Æß₧╕ΓÇïß₧èßƒåß₧íß₧╛ß₧äΓÇïß₧Çß₧ëßƒÆß
₧àß₧ößƒï'
application-label-zh-HK:'τ¿ïσ╝Åσ«ëΦú¥σÖ¿'
application-label-si-LK:'α╢┤α╖Éα╢Üα╖Üα╢ó α╖âα╖èα╢«α╖Åα╢┤α╢▒α╢Üα╢╗α╖ö'
application-label-mk-MK:'╨ÿ╨╜╤ü╤é╨░╨╗╨░╤é╨╛╤Ç ╨╜╨░ ╨┐╨░╨║╨╡╤é'
application-label-hy-AM:'╒ô╒í╒⌐╒Ñ╒⌐╒½ ╒┐╒Ñ╒▓╒í╒ñ╓Ç╒½╒╣'
application-label-my-MM:'Package ßÇæßÇèßÇ╖ßÇ║ßÇ₧ßÇ╜ßÇäßÇ║ßÇ╕ßÇüßÇ╝ßÇäßÇ║ßÇ╕'
application-label-zh-CN:'Φ╜»Σ╗╢σîàσ«ëΦúàτ¿ïσ║Å'
application-label-ta-IN:'α«¬α»çα«òα»ìα«òα»çα«£α»ì α«çα«⌐α»ìα«╕α»ìα«ƒα«╛α«▓α«░α»ì
'
application-label-te-IN:'α░¬α▒ìα░»α░╛α░òα▒çα░£α▒Ç α░çα░¿α▒ìΓÇîα░╕α▒ìα░ƒα░╛α░▓α░░
α▒ì'
application-label-ml-IN:'α┤¬α┤╛α┤òα╡ìα┤òα╡çα┤£α╡ì α┤çα╡╗α┤╕α╡ìΓÇîα┤▒α╡ìα┤▒α┤╛α┤│
α╡╝'
application-label-en-IN:'Package installer'
application-label-kn-IN:'α▓¬α│ìα▓»α▓╛α▓òα│çα▓£α│ì α▓╕α│ìα▓Ñα▓╛α▓¬α▓ò'
application-label-mr-IN:'αñ¬αÑàαñòαÑçαñ£ αñ╕αÑìΓÇìαñÑαñ╛αñ¬αñ¿αñòαñ░αÑìαññαñ╛'
application-label-mn-MN:'╨æ╨░╨│╤å ╤ü╤â╤â╨╗╨│╨░╨│╤ç'
application-label-ne-NP:'αñ¬αÑìαñ»αñ╛αñòαÑçαñ£ αñ╕αÑìαñÑαñ╛αñ¬αñ¿αñòαñ░αÑìαññαñ╛
'
application-label-pt-BR:'Instalador do pacote'
application-label-gl-ES:'Instalador de paquetes'
application-label-eu-ES:'Pakete-instalatzailea'
application-label-is-IS:'Uppsetningarforrit pakka'
application-label-es-US:'Programa de instalaci├│n del paquete'
application-label-pt-PT:'Programa de instala├º├úo do pacote'
application-label-en-AU:'Package installer'
application-label-zh-TW:'τ¿ïσ╝Åσ«ëΦú¥σÖ¿'
application-label-ms-MY:'Pemasang pakej'
application: label='Package installer' icon=''
uses-feature:'android.hardware.touchscreen'
uses-implied-feature:'android.hardware.touchscreen','assumed you require a touch
screen unless explicitly made optional'
other-activities
other-receivers
supports-screens: 'small' 'normal' 'large' 'xlarge'
supports-any-density: 'true'
locales: '--_--' 'ca' 'da' 'fa' 'ja' 'nb' 'de' 'af' 'bg' 'th' 'fi' 'hi' 'vi' 'sk
' 'uk' 'el' 'nl' 'pl' 'sl' 'tl' 'am' 'in' 'ko' 'ro' 'ar' 'fr' 'hr' 'sr' 'tr' 'cs
' 'es' 'it' 'lt' 'pt' 'hu' 'ru' 'zu' 'lv' 'sv' 'iw' 'sw' 'fr-CA' 'lo-LA' 'en-XA'
'en-GB' 'ar-XB' 'bn-BD' 'et-EE' 'ka-GE' 'ky-KG' 'km-KH' 'zh-HK' 'si-LK' 'mk-MK'
'hy-AM' 'my-MM' 'zh-CN' 'ta-IN' 'te-IN' 'ml-IN' 'en-IN' 'kn-IN' 'mr-IN' 'mn-MN'
'ne-NP' 'pt-BR' 'gl-ES' 'eu-ES' 'is-IS' 'es-US' 'pt-PT' 'en-AU' 'zh-TW' 'ms-MY'

densities: '160' '240' '320' '480' '640'