Enforce FirstContentfulPaint <= FirstMeaningfulPaint

third_party/WebKit/Source/core/paint/FirstMeaningfulPaintDetectorTest.cpp

 // 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.
 
 #include "core/paint/FirstMeaningfulPaintDetector.h"
 
 #include "core/paint/PaintTiming.h"
 #include "core/testing/DummyPageHolder.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 98 matching lines @@
        NetworkStableBeforeFirstContentfulPaint) {
   paintTiming().markFirstPaint();
   simulateLayoutAndPaint(1);
   simulateNetworkStable();
   EXPECT_EQ(paintTiming().firstMeaningfulPaint(), 0.0);
   paintTiming().markFirstContentfulPaint();
   simulateNetworkStable();
   EXPECT_NE(paintTiming().firstMeaningfulPaint(), 0.0);
 }
 
+TEST_F(FirstMeaningfulPaintDetectorTest,
+       FirstMeaningfulPaintShouldNotBeBeforeFirstContentfulPaint) {
+  paintTiming().markFirstPaint();
+  simulateLayoutAndPaint(10);
+  paintTiming().markFirstContentfulPaint();
+  simulateNetworkStable();
+  EXPECT_GE(paintTiming().firstMeaningfulPaint(),
+            paintTiming().firstContentfulPaint());
+}
+
 }  // namespace blink