Add statsd.

It doesn't start yet by default. When you start it manually, it sets
itself up as a binder system service and starts a thread to read the
event log.

Test: Run statsd, observe output. also run stats_test
Change-Id: If435d6a80fef3c1d957aedb61699bf5e9aae7e56
diff --git a/Android.mk b/Android.mk
index 33936f3..e61d7c2 100644
--- a/Android.mk
+++ b/Android.mk
@@ -270,6 +270,7 @@
 	core/java/android/os/IRecoverySystemProgressListener.aidl \
 	core/java/android/os/IRemoteCallback.aidl \
 	core/java/android/os/ISchedulingPolicyService.aidl \
+	core/java/android/os/IStatsManager.aidl \
 	core/java/android/os/IThermalEventListener.aidl \
 	core/java/android/os/IThermalService.aidl \
 	core/java/android/os/IUpdateLock.aidl \