[instrumentation] Introduce JSON5 config files for probe generator.

third_party/WebKit/Source/build/scripts/templates/ProbeSink.h.tmpl

 // This file is generated from {{input_file}}
 
 // Copyright 2017 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.
 
 {% set sink_class = (name | to_singular) + "Sink" %}
+{% set export_symbol = config["settings"]["export_symbol"] %}
 
 #ifndef {{sink_class}}_h
 #define {{sink_class}}_h
 
 #include "platform/heap/HeapAllocator.h"
-{% for define in defines %}
-{{define}}
-{% endfor %}
 
 namespace blink {
 
 {% for agent in agents %}
 class {{ agent | agent_name_to_class }};
 {% endfor %}
 
-class PROBE_EXPORT {{sink_class}} : public GarbageCollected<{{sink_class}}> {
+class {{export_symbol}} {{sink_class}} : public GarbageCollected<{{sink_class}}> {
   WTF_MAKE_NONCOPYABLE({{sink_class}});
 
  public:
   {{sink_class}}();
   DECLARE_TRACE();
 
 {% for agent in agents %}
 {% set class_name = agent | agent_name_to_class %}
 {% set getter_name = class_name | to_lower_case %}
   bool has{{class_name}}s() const { return m_has{{class_name}}s; }
   const HeapHashSet<Member<{{class_name}}>>& {{getter_name}}s() const { return m_{{getter_name}}s; }
   void add{{class_name}}({{class_name}}* agent);
   void remove{{class_name}}({{class_name}}* agent);
 
 {% endfor %}
  private:
 {% for agent in agents %}
 {% set class_name = agent | agent_name_to_class %}
 {% set getter_name = class_name | to_lower_case %}
   HeapHashSet<Member<{{class_name}}>> m_{{getter_name}}s;
   bool m_has{{class_name}}s = false;
 {% endfor %}
 };
 
 } // namespace blink
 
 #endif // !defined({{sink_class}}_h)