Merge changes I00d6980a,I814221b4,Id88603a5

* changes:
  CameraBrowser: Launch itself when a camera is attached to USB.
  Send Intents when PTP compatible devices are connected/disconnected to USB
  Give system server permission to access USB.

core/java/com/android/internal/os/ZygoteInit.java

@@ -523,7 +523,7 @@ public class ZygoteInit {
         String args[] = {
             "--setuid=1000",
             "--setgid=1000",
-            "--setgroups=1001,1002,1003,1004,1005,1006,1007,1008,1009,1010,3001,3002,3003",
+            "--setgroups=1001,1002,1003,1004,1005,1006,1007,1008,1009,1010,1018,3001,3002,3003",
             "--capabilities=130104352,130104352",
             "--runtime-init",
             "--nice-name=system_server",