Merge "Add hidden Binder.getCallingUidOrWtf" am: e5a82fc9a2

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2324515

Change-Id: Ib8b6ae6d47aa42aecf6078a71cd6cfdd312f09dc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

core/java/android/os/Binder.java

@@ -354,6 +354,26 @@ public class Binder implements IBinder {
         return getCallingUid();
     }
 
+    /**
+     * Return the Linux UID assigned to the process that sent the transaction
+     * currently being processed.
+     *
+     * Logs WTF if the current thread is not currently
+     * executing an incoming transaction and the calling identity has not been
+     * explicitly set with {@link #clearCallingIdentity()}
+     *
+     * @hide
+     */
+    public static final int getCallingUidOrWtf() {
+        if (!isDirectlyHandlingTransaction() && !hasExplicitIdentity()) {
+            Log.wtf(TAG,
+                    "Thread is not in a binder transaction, "
+                            + "and the calling identity has not been "
+                            + "explicitly set with clearCallingIdentity");
+        }
+        return getCallingUid();
+    }
+
     /**
      * Return the UserHandle assigned to the process that sent you the
      * current transaction that is being processed. This is the user