Merge "Add dataFailCause existence check" am: 478a6e14d9

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2094529

Change-Id: I8c84b42e45e58624687f9df38f8aec46b9f905b4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

telephony/java/android/telephony/DataFailCause.java

@@ -1673,4 +1673,9 @@ public final class DataFailCause {
             return UNKNOWN;
         }
     }
+
+    /** @hide */
+    public static boolean isFailCauseExisting(@DataFailureCause int failCause) {
+        return sFailCauseMap.containsKey(failCause);
+    }
 }