Debugger: Use DebuggerCommand in QML engine

... instead of manually set up JSON. It's more concise, and paves the
way to use per-command callbacks as in the other engines.

Change-Id: Ib5cf9c9b882ec0ec87acd7c1ceb938d3ee60346b
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>

src/plugins/debugger/debuggerprotocol.cpp

@@ -782,6 +782,16 @@ void DebuggerCommand::arg(const char *name, const char *value)
     args.append("\",");
 }
 
+void DebuggerCommand::arg(const char *name, const QList<int> &list)
+{
+    beginList(name);
+    foreach (int item, list) {
+        args.append(QByteArray::number(item));
+        args.append(',');
+    }
+    endList();
+}
+
 void DebuggerCommand::arg(const char *value)
 {
     args.append("\"");
@@ -823,5 +833,13 @@ void DebuggerCommand::endGroup()
     args += "},";
 }
 
+QByteArray DebuggerCommand::arguments() const
+{
+    QByteArray result = args;
+    if (result.endsWith(','))
+        result.chop(1);
+    return result;
+}
+
 } // namespace Internal
 } // namespace Debugger