Add a new error code for disallowing concurrent bugreports

BUG:123571915
Test: manual
Change-Id: I8787137c3cfeb33aacfa439f6eab1a668977e572
diff --git a/services/core/java/com/android/server/os/BugreportManagerServiceImpl.java b/services/core/java/com/android/server/os/BugreportManagerServiceImpl.java
index 1dada92..f4454ae 100644
--- a/services/core/java/com/android/server/os/BugreportManagerServiceImpl.java
+++ b/services/core/java/com/android/server/os/BugreportManagerServiceImpl.java
@@ -146,8 +146,8 @@
         if (isDumpstateBinderServiceRunningLocked()) {
             Slog.w(TAG, "'dumpstate' is already running. Cannot start a new bugreport"
                     + " while another one is currently in progress.");
-            // TODO(b/111441001): Use a new error code; add this to the documentation of the API.
-            reportError(listener, IDumpstateListener.BUGREPORT_ERROR_RUNTIME_ERROR);
+            reportError(listener,
+                    IDumpstateListener.BUGREPORT_ERROR_ANOTHER_REPORT_IN_PROGRESS);
             return;
         }