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.h b/cmds/statsd/src/StatsService.h
index cdff50f..941ed46 100644
--- a/cmds/statsd/src/StatsService.h
+++ b/cmds/statsd/src/StatsService.h
@@ -173,6 +173,19 @@
     virtual Status sendAppBreadcrumbAtom(int32_t label, int32_t state) override;
 
     /**
+     * Binder call to register a callback function for a vendor pulled atom.
+     * Note: this atom must NOT have uid as a field.
+     */
+    virtual Status registerPullerCallback(int32_t atomTag,
+        const sp<android::os::IStatsPullerCallback>& pullerCallback,
+        const String16& packageName) override;
+
+    /**
+     * Binder call to unregister any existing callback function for a vendor pulled atom.
+     */
+    virtual Status unregisterPullerCallback(int32_t atomTag, const String16& packageName) override;
+
+    /**
      * Binder call to get SpeakerImpedance atom.
      */
     virtual Return<void> reportSpeakerImpedance(const SpeakerImpedance& speakerImpedance) override;