Add metric title for inspector

Bug: 62957185
Change-Id: I41452a059c4886ceb152b1c06655e284401a1803
diff --git a/src/com/android/documentsui/Metrics.java b/src/com/android/documentsui/Metrics.java
index cb30e2d..224d668 100644
--- a/src/com/android/documentsui/Metrics.java
+++ b/src/com/android/documentsui/Metrics.java
@@ -350,7 +350,8 @@
             USER_ACTION_CUT_CLIPBOARD,
             USER_ACTION_COMPRESS,
             USER_ACTION_EXTRACT_TO,
-            USER_ACTION_VIEW_IN_APPLICATION
+            USER_ACTION_VIEW_IN_APPLICATION,
+            USER_ACTION_INSPECTOR
     })
     @Retention(RetentionPolicy.SOURCE)
     public @interface UserAction {}