Propogate loading behavior data from Blink to content/

third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp

 /*
  * 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 35 matching lines @@
 #include "core/loader/DocumentLoader.h"
 #include "core/loader/LinkLoader.h"
 #include "core/loader/NavigationScheduler.h"
 #include "platform/Histogram.h"
 #include "platform/SharedBuffer.h"
 #include "platform/ThreadSafeFunctional.h"
 #include "platform/TraceEvent.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebFrameScheduler.h"
+#include "public/platform/WebLoadingData.h"
 #include "public/platform/WebScheduler.h"
 #include "public/platform/WebThread.h"
 #include "wtf/RefCounted.h"
 #include "wtf/TemporaryChange.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 // This is a direct transcription of step 4 from:
@@ skipping 1089 matching lines @@
         m_options,
         document()->url(),
         CachedDocumentParameters::create(document()),
         MediaValuesCached::MediaValuesCachedData(*document()));
 }
 
 void HTMLDocumentParser::evaluateAndPreloadScriptForDocumentWrite(const String& source)
 {
     if (!m_evaluator->shouldEvaluate(source))
         return;
+    document()->loader()->didObserveLoadingBehavior(WebLoadingData::DocumentWriteEvaluatorExperiment);
+    if (!RuntimeEnabledFeatures::documentWriteEvaluatorEnabled())
+        return;
     TRACE_EVENT0("blink", "HTMLDocumentParser::evaluateAndPreloadScriptForDocumentWrite");
 
     double initializeStartTime = monotonicallyIncreasingTimeMS();
     bool neededInitialization = m_evaluator->ensureEvaluationContext();
     double initializationDuration = monotonicallyIncreasingTimeMS() - initializeStartTime;
 
     double startTime = monotonicallyIncreasingTimeMS();
     String writtenSource = m_evaluator->evaluateAndEmitWrittenSource(source);
     double duration = monotonicallyIncreasingTimeMS() - startTime;
 
@@ skipping 14 matching lines @@
         DEFINE_STATIC_LOCAL(CustomCountHistogram, successHistogram, ("PreloadScanner.DocumentWrite.ExecutionTime.Success", 1, 10000, 50));
         successHistogram.count(duration);
     } else {
         DEFINE_STATIC_LOCAL(CustomCountHistogram, failureHistogram, ("PreloadScanner.DocumentWrite.ExecutionTime.Failure", 1, 10000, 50));
         failureHistogram.count(duration);
     }
 
 }
 
 } // namespace blink