drm: add event for resource manager.

Bug: 19265536
Change-Id: I524962f84aefae28a8ffd411d1bb6521bedb02a7
diff --git a/include/media/drm/DrmAPI.h b/include/media/drm/DrmAPI.h
index 49939fd..6e84ab4 100644
--- a/include/media/drm/DrmAPI.h
+++ b/include/media/drm/DrmAPI.h
@@ -80,7 +80,8 @@
             kDrmPluginEventProvisionRequired = 1,
             kDrmPluginEventKeyNeeded,
             kDrmPluginEventKeyExpired,
-            kDrmPluginEventVendorDefined
+            kDrmPluginEventVendorDefined,
+            kDrmPluginEventSessionReclaimed
         };
 
         // Drm keys can be for offline content or for online streaming.