libmediadrm: API to set playback id

Bug: 159337195
Bug: 168341163
Test: GtsMediaTestCases MediaDrmTest#testSetPlaybackId
Change-Id: I9fad0ff83d465459443b018f589ccb78047aa71a
diff --git a/drm/libmediadrm/include/mediadrm/DrmHal.h b/drm/libmediadrm/include/mediadrm/DrmHal.h
index 4705de0..2fd4d81 100644
--- a/drm/libmediadrm/include/mediadrm/DrmHal.h
+++ b/drm/libmediadrm/include/mediadrm/DrmHal.h
@@ -184,6 +184,10 @@
             const char *mime,
             DrmPlugin::SecurityLevel securityLevel) const;
 
+    virtual status_t setPlaybackId(
+            Vector<uint8_t> const &sessionId,
+            const char *playbackId);
+
     // Methods of IDrmPluginListener
     Return<void> sendEvent(EventType eventType,
             const hidl_vec<uint8_t>& sessionId, const hidl_vec<uint8_t>& data);