Statsd Puller Callback Registration

Creates a hidden api to register puller callbacks for vendor atoms.

Test: manual local test
Test: statsd unit tests
Bug: 119898637
Change-Id: Id28817b8fc718e128adc4e1c6b2e997db84517f9
diff --git a/Android.bp b/Android.bp
index 7bdedc7..0848d2b 100644
--- a/Android.bp
+++ b/Android.bp
@@ -804,6 +804,7 @@
     srcs: [
         "core/java/android/os/IStatsCompanionService.aidl",
         "core/java/android/os/IStatsManager.aidl",
+        "core/java/android/os/IStatsPullerCallback.aidl",
     ],
 }