[instrumentation] Generalize instrumentation to be used beyond the core layer

third_party/WebKit/Source/core/inspector/InstrumentingAgents_h.template

-// 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.
-
-#ifndef InstrumentingAgents_h
-#define InstrumentingAgents_h
-
-#include "core/CoreExport.h"
-#include "platform/heap/HeapAllocator.h"
-
-namespace blink {
-
-{% for agent in agents %}
-class {{ agent | agent_name_to_class }};
-{% endfor %}
-
-class CORE_EXPORT InstrumentingAgents : public GarbageCollected<InstrumentingAgents> {
-  WTF_MAKE_NONCOPYABLE(InstrumentingAgents);
-
- public:
-  InstrumentingAgents();
-  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(InstrumentingAgents_h)