DevTools: generate frontend and backend interfaces under domains.

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 "platform/inspector_protocol/String16.h"
 
 namespace blink {
 namespace protocol {
 
 Frontend::Frontend(FrontendChannel* frontendChannel)
     : m_frontendChannel(frontendChannel)
 {% for domain in api.domains %}
     , m_{{domain.domain | lower}}(frontendChannel)
 {% endfor %}
 {
 }
+{% for domain in api.domains %}
 
-{% for domain in api.domains %}
+{{domain.domain}}::Frontend* {{domain.domain}}::Frontend::from(protocol::Frontend* frontend)
+{
+    return &(frontend->m_{{domain.domain | lower}});
+}
   {% for event in domain.events %}
     {% if "handlers" in event and not ("renderer" in event["handlers"]) %}{% continue %}{% endif %}
-void Frontend::{{domain.domain}}::{{event.name}}(
+
+void {{domain.domain}}::Frontend::{{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 -%})
 {
     std::unique_ptr<protocol::DictionaryValue> jsonMessage = DictionaryValue::create();
     jsonMessage->setString("method", "{{domain.domain}}.{{event.name}}");
     std::unique_ptr<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({{resolve_type(parameter).to_raw_type % parameter.name}}));
       {% endif %}
     {% endfor %}
     jsonMessage->setObject("params", std::move(paramsObject));
     if (m_frontendChannel)
         m_frontendChannel->sendProtocolNotification(jsonMessage->toJSONString());
 }
   {% endfor %}
 {% endfor %}
 
 } // namespace protocol
 } // namespace blink