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/cmds/statsd/src/StatsService.cpp b/cmds/statsd/src/StatsService.cpp
index 86bf3ec..bd21a95 100644
--- a/cmds/statsd/src/StatsService.cpp
+++ b/cmds/statsd/src/StatsService.cpp
@@ -1057,6 +1057,24 @@
     return Status::ok();
 }
 
+Status StatsService::registerPullerCallback(int32_t atomTag,
+        const sp<android::os::IStatsPullerCallback>& pullerCallback,
+        const String16& packageName) {
+    ENFORCE_DUMP_AND_USAGE_STATS(packageName);
+
+    VLOG("StatsService::registerPullerCallback called.");
+    mPullerManager->RegisterPullerCallback(atomTag, pullerCallback);
+    return Status::ok();
+}
+
+Status StatsService::unregisterPullerCallback(int32_t atomTag, const String16& packageName) {
+    ENFORCE_DUMP_AND_USAGE_STATS(packageName);
+
+    VLOG("StatsService::unregisterPullerCallback called.");
+    mPullerManager->UnregisterPullerCallback(atomTag);
+    return Status::ok();
+}
+
 hardware::Return<void> StatsService::reportSpeakerImpedance(
         const SpeakerImpedance& speakerImpedance) {
     LogEvent event(getWallClockSec() * NS_PER_SEC, getElapsedRealtimeNs(), speakerImpedance);