Instrument parser blocking script execution time.

third_party/WebKit/Source/core/dom/ScriptRunner.h

 /*
  * Copyright (C) 2010 Google, Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 30 matching lines @@
 class WebTaskRunner;
 
 class CORE_EXPORT ScriptRunner final : public GarbageCollected<ScriptRunner> {
     WTF_MAKE_NONCOPYABLE(ScriptRunner);
 public:
     static ScriptRunner* create(Document* document)
     {
         return new ScriptRunner(document);
     }
 
-    enum ExecutionType { ASYNC_EXECUTION, IN_ORDER_EXECUTION };
-    void queueScriptForExecution(ScriptLoader*, ExecutionType);
+    enum AsyncExecutionType { NoExecType, AsyncExecution, InOrderExecution };

[kouhei (in TOK), 2016/08/29 00:20:49]

Optional: enum class is preferred over enum.
enum class AsyncExecutionType { None, Async, InOrder }; ?

+    void queueScriptForExecution(ScriptLoader*, AsyncExecutionType);
     bool hasPendingScripts() const { return !m_pendingInOrderScripts.isEmpty() || !m_pendingAsyncScripts.isEmpty(); }
     void suspend();
     void resume();
-    void notifyScriptReady(ScriptLoader*, ExecutionType);
-    void notifyScriptLoadError(ScriptLoader*, ExecutionType);
+    void notifyScriptReady(ScriptLoader*, AsyncExecutionType);
+    void notifyScriptLoadError(ScriptLoader*, AsyncExecutionType);
 
     static void movePendingScript(Document&, Document&, ScriptLoader*);
 
     DECLARE_TRACE();
 
 private:
     class Task;
 
     explicit ScriptRunner(Document*);
 
@@ skipping 22 matching lines @@
 
     bool m_isSuspended;
 #ifndef NDEBUG
     bool m_hasEverBeenSuspended;
 #endif
 };
 
 } // namespace blink
 
 #endif // ScriptRunner_h