DevTools: introduce protocol::Value, baseline for hierarchical data in remote debugging protocol.

third_party/WebKit/Source/platform/inspector_protocol/Frontend_cpp.template

 // This file is generated
 
 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/inspector_protocol/{{class_name}}.h"
 
 #include "wtf/text/CString.h"
 #include "wtf/text/WTFString.h"
@@ skipping 14 matching lines @@
     {% if "handlers" in event and not ("renderer" in event["handlers"]) %}{% continue %}{% endif %}
 void Frontend::{{domain.domain}}::{{event.name}}(
     {%- for parameter in event.parameters %}
       {% if "optional" in parameter -%}
         const Maybe<{{resolve_type(parameter).raw_type}}>&
       {%- else -%}
         {{resolve_type(parameter).pass_type}}
       {%- endif %} {{parameter.name}}{%- if not loop.last -%}, {% endif -%}
     {% endfor -%})
 {
-    RefPtr<JSONObject> jsonMessage = JSONObject::create();
+    RefPtr<protocol::DictionaryValue> jsonMessage = DictionaryValue::create();
     jsonMessage->setString("method", "{{domain.domain}}.{{event.name}}");
-    RefPtr<JSONObject> paramsObject = JSONObject::create();
+    RefPtr<protocol::DictionaryValue> paramsObject = DictionaryValue::create();
     {% for parameter in event.parameters %}
       {% if "optional" in parameter %}
     if ({{parameter.name}}.isJust())
         paramsObject->setValue("{{parameter.name}}", toValue({{parameter.name}}.fromJust()));
       {% else %}
     paramsObject->setValue("{{parameter.name}}", toValue({{parameter.name}}));
       {% endif %}
     {% endfor %}
     jsonMessage->setObject("params", paramsObject);
     if (m_frontendChannel)
         m_frontendChannel->sendProtocolNotification(jsonMessage.release());
 }
   {% endfor %}
 {% endfor %}
 
 } // namespace protocol
 } // namespace blink