Loosen FirstMeaningfulPaint UMA network-idle heuristics

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef FirstMeaningfulPaintDetector_h
 #define FirstMeaningfulPaintDetector_h
 
 #include "core/CoreExport.h"
 #include "platform/Timer.h"
 #include "platform/heap/Handle.h"
@@ skipping 35 matching lines @@
                                          int contentsHeightAfterLayout,
                                          int visibleHeight);
   void notifyPaint();
   void checkNetworkStable();
 
   DECLARE_TRACE();
 
  private:
   friend class FirstMeaningfulPaintDetectorTest;
 
+  enum NetworkState { NetworkActive, Network2Quiet, Network0Quiet };

[kouhei (in TOK), 2017/02/28 23:47:32]

Optional: enum class NetworkState { Active, Quiet2, Quiet0 };

+
   Document* document();
+  bool isNetworkQuiet(int maxActiveConnections);
   void networkStableTimerFired(TimerBase*);
 
-  enum State { NextPaintIsNotMeaningful, NextPaintIsMeaningful, Reported };
-  State m_state = NextPaintIsNotMeaningful;
+  bool m_nextPaintIsMeaningful = false;
+  NetworkState m_networkState = NetworkActive;
+  NetworkState m_networkStateAtFirstMeaningfulPaint = NetworkActive;
 
   Member<PaintTiming> m_paintTiming;
   double m_provisionalFirstMeaningfulPaint = 0.0;
   double m_maxSignificanceSoFar = 0.0;
   double m_accumulatedSignificanceWhileHavingBlankText = 0.0;
   unsigned m_prevLayoutObjectCount = 0;
   bool m_seenFirstMeaningfulPaintCandidate = false;
   TaskRunnerTimer<FirstMeaningfulPaintDetector> m_networkStableTimer;
 };
 
 }  // namespace blink
 
 #endif