Instrument parser blocking script execution time.

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

Index: third_party/WebKit/Source/core/dom/ScriptRunner.h
diff --git a/third_party/WebKit/Source/core/dom/ScriptRunner.h b/third_party/WebKit/Source/core/dom/ScriptRunner.h
index 6d7201ea4ef5ffcf097dc298bab9f7e31c9b4b35..fa76d220085b022445d538a8f0732937f58790b1 100644
--- a/third_party/WebKit/Source/core/dom/ScriptRunner.h
+++ b/third_party/WebKit/Source/core/dom/ScriptRunner.h
@@ -48,13 +48,13 @@ public:
         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*);