Include debugger connection status in error entry

Include the debugger connection status when adding error entry
to DropBox if debugger is connected, "Debugger: Connected".

This can be useful to sort out crashes comming from developers
vs from regular usage.

Change-Id: Ic309066c63778af1577f2b91a95ffca0bd40338c

services/java/com/android/server/am/ActivityManagerService.java

@@ -9252,6 +9252,9 @@ public final class ActivityManagerService extends ActivityManagerNative implemen
             sb.append("Subject: ").append(subject).append("\n");
         }
         sb.append("Build: ").append(Build.FINGERPRINT).append("\n");
+        if (Debug.isDebuggerConnected()) {
+            sb.append("Debugger: Connected\n");
+        }
         sb.append("\n");
 
         // Do the rest in a worker thread to avoid blocking the caller on I/O