OverscrollGlow for mainThread-{BLINK CHANGES}

Source/platform/scroll/Scrollbar.cpp

Index: Source/platform/scroll/Scrollbar.cpp
diff --git a/Source/platform/scroll/Scrollbar.cpp b/Source/platform/scroll/Scrollbar.cpp
index 07259f15b85dfa1215a327064ec61e68adf41bb0..86bc7900dbb225d01ef881f6232c05b67a30fe76 100644
--- a/Source/platform/scroll/Scrollbar.cpp
+++ b/Source/platform/scroll/Scrollbar.cpp
@@ -226,7 +226,7 @@ void Scrollbar::autoscrollPressedPart(double delay)
     }
 
     // Handle the arrows and track.
-    if (m_scrollableArea && m_scrollableArea->userScroll(pressedPartScrollDirectionPhysical(), pressedPartScrollGranularity()))
+    if (m_scrollableArea && m_scrollableArea->userScroll(pressedPartScrollDirectionPhysical(), pressedPartScrollGranularity()).didScroll)
         startTimerIfNeeded(delay);
 }
 
@@ -377,7 +377,7 @@ bool Scrollbar::gestureEvent(const PlatformGestureEvent& evt)
         return false;
     case PlatformEvent::GestureTap: {
         if (m_pressedPart != ThumbPart && m_pressedPart != NoPart && m_scrollableArea
-            && m_scrollableArea->userScroll(pressedPartScrollDirectionPhysical(), pressedPartScrollGranularity())) {
+            && m_scrollableArea->userScroll(pressedPartScrollDirectionPhysical(), pressedPartScrollGranularity()).didScroll) {
             return true;
         }
         m_scrollPos = 0;