Record box shadow as main thread scrolling reasons

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

Index: third_party/WebKit/Source/web/tests/ScrollingCoordinatorTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/ScrollingCoordinatorTest.cpp b/third_party/WebKit/Source/web/tests/ScrollingCoordinatorTest.cpp
index b63f40506c09166436649eeee8c49008228350e3..ac274b9855e0adbcfb3a1e5a60d53af2fbe99520 100644
--- a/third_party/WebKit/Source/web/tests/ScrollingCoordinatorTest.cpp
+++ b/third_party/WebKit/Source/web/tests/ScrollingCoordinatorTest.cpp
@@ -1037,7 +1037,8 @@ class StyleRelatedMainThreadScrollingReasonTest
   static const uint32_t m_LCDTextRelatedReasons =
       MainThreadScrollingReason::kHasOpacityAndLCDText |
       MainThreadScrollingReason::kHasTransformAndLCDText |
-      MainThreadScrollingReason::kBackgroundNotOpaqueInRectAndLCDText;
+      MainThreadScrollingReason::kBackgroundNotOpaqueInRectAndLCDText |
+      MainThreadScrollingReason::kHasBoxShadowAndLCDText;
 
  protected:
   StyleRelatedMainThreadScrollingReasonTest() {
@@ -1154,4 +1155,8 @@ TEST_F(StyleRelatedMainThreadScrollingReasonTest, LCDTextEnabledTest) {
                 MainThreadScrollingReason::kHasBorderRadius);
 }
 
+TEST_F(StyleRelatedMainThreadScrollingReasonTest, BoxShadowTest) {
+  testStyle("box-shadow", MainThreadScrollingReason::kHasBoxShadowAndLCDText);
+}
+
 }  // namespace blink