scheduler: Detect load RAIL mode

third_party/WebKit/Source/core/paint/PaintTiming.h

Index: third_party/WebKit/Source/core/paint/PaintTiming.h
diff --git a/third_party/WebKit/Source/core/paint/PaintTiming.h b/third_party/WebKit/Source/core/paint/PaintTiming.h
index 488a2a3b68c5134ae9d75721e8d26f1fdc33b356..dffe87eb4354582e7d3c04a894d34cd1d056cf3c 100644
--- a/third_party/WebKit/Source/core/paint/PaintTiming.h
+++ b/third_party/WebKit/Source/core/paint/PaintTiming.h
@@ -43,6 +43,7 @@ class CORE_EXPORT PaintTiming final
   void markFirstTextPaint();
   void markFirstImagePaint();
 
+  void markFirstMeaningfulPaintCandidate();
   void setFirstMeaningfulPaint(double stamp);
   void notifyPaint(bool isFirstPaint, bool textPainted, bool imagePainted);
 
@@ -99,6 +100,8 @@ class CORE_EXPORT PaintTiming final
   double m_firstContentfulPaint = 0.0;
   double m_firstMeaningfulPaint = 0.0;
 
+  bool m_seenFirstMeaningfulPaintCandidate = false;
+
   Member<Document> m_document;
   Member<FirstMeaningfulPaintDetector> m_fmpDetector;
 };