Java API for pulled atoms

This creates a java API for registering pullers. Will implement the
statsd side in a follow up CL.

Test: builds, boots
Change-Id: Ib6735984297ce3148839a6370a3c15b2a585baf5
diff --git a/cmds/statsd/src/StatsService.cpp b/cmds/statsd/src/StatsService.cpp
index b665a8b..f072c9c 100644
--- a/cmds/statsd/src/StatsService.cpp
+++ b/cmds/statsd/src/StatsService.cpp
@@ -1289,6 +1289,13 @@
     return Status::ok();
 }
 
+Status StatsService::registerPullAtomCallback(int32_t uid, int32_t atomTag, int64_t coolDownNs,
+                                    int64_t timeoutNs, const std::vector<int32_t>& additiveFields,
+                                    const sp<android::os::IPullAtomCallback>& pullerCallback) {
+    VLOG("StatsService::registerPuller called.");
+    return Status::ok();
+}
+
 Status StatsService::unregisterPullerCallback(int32_t atomTag, const String16& packageName) {
     ENFORCE_DUMP_AND_USAGE_STATS(packageName);