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..3bf7b7ec65f1f6c813867a273bd919877c2cbf7c 100644
--- a/third_party/WebKit/Source/core/dom/ScriptRunner.h
+++ b/third_party/WebKit/Source/core/dom/ScriptRunner.h
@@ -48,13 +48,17 @@ public:
         return new ScriptRunner(document);
     }
 
-    enum ExecutionType { ASYNC_EXECUTION, IN_ORDER_EXECUTION };
-    void queueScriptForExecution(ScriptLoader*, ExecutionType);
+    // Async scripts may either execute asynchronously (as their load
+    // completes), or 'in order'. See
+    // http://www.html5rocks.com/en/tutorials/speed/script-loading/ for more
+    // information.
+    enum 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*);