Inspector: wrapped inspector agent instances into factory-like wrappers

Source/core/inspector/CodeGeneratorInspectorStrings.py

Index: Source/core/inspector/CodeGeneratorInspectorStrings.py
diff --git a/Source/core/inspector/CodeGeneratorInspectorStrings.py b/Source/core/inspector/CodeGeneratorInspectorStrings.py
index 6c3fe05a1f087c9cde2e101d1808da175b533a5a..74c698c662728107cba0cf5079500b52c15a2efb 100644
--- a/Source/core/inspector/CodeGeneratorInspectorStrings.py
+++ b/Source/core/inspector/CodeGeneratorInspectorStrings.py
@@ -48,14 +48,15 @@ backend_method = (
 {
     RefPtr<InspectorArray> protocolErrors = InspectorArray::create();
 
-    if (!$agentField)
+    $handlerClass* handler = $agentField ? $agentField->getCommandHandler() : 0;
+    if (!handler)
         protocolErrors->pushString("${domainName} handler is not available.");
 $methodOutCode
 $methodInCode
     RefPtr<InspectorObject> result = InspectorObject::create();
     ErrorString error;
     if (!protocolErrors->length()) {
-        $agentField->$methodName(&error$agentCallParams);
+        handler->$methodName(&error$agentCallParams);
 
 ${responseCook}
     }