Record non-stacking-context as main thread scrolling reasons

third_party/WebKit/Source/web/tests/ScrollMetricsTest.cpp

Index: third_party/WebKit/Source/web/tests/ScrollMetricsTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/ScrollMetricsTest.cpp b/third_party/WebKit/Source/web/tests/ScrollMetricsTest.cpp
index 9f344d0c037d3930a99c02cd583bf0ea6163e631..a4d1b2d10faae19ed8350b8c098c9c33b61a915a 100644
--- a/third_party/WebKit/Source/web/tests/ScrollMetricsTest.cpp
+++ b/third_party/WebKit/Source/web/tests/ScrollMetricsTest.cpp
@@ -347,9 +347,13 @@ TEST_F(NonCompositedMainThreadScrollingReasonRecordTest, NestedScrollersTest) {
   // areas from the chain have corresponding reasons.
   EXPECT_WHEEL_BUCKET(kHasOpacityAndLCDText, 1);
   EXPECT_WHEEL_BUCKET(kBackgroundNotOpaqueInRectAndLCDText, 1);
+  EXPECT_WHEEL_BUCKET(
+      kHasOverflowClipAndLayoutObjectBackgroundNotOpaqueAndLCDText, 1);
+  EXPECT_WHEEL_BUCKET(kIsNotStackingContextAndLCDText, 1);
   EXPECT_WHEEL_BUCKET(kHasBorderRadius, 1);
+
   EXPECT_WHEEL_BUCKET(kHasTransformAndLCDText, 0);
-  EXPECT_WHEEL_TOTAL(3);
+  EXPECT_WHEEL_TOTAL(5);
 }
 
 }  // namespace