Selectively disable rubber banding on mac.

Source/platform/scroll/ScrollableArea.cpp

Index: Source/platform/scroll/ScrollableArea.cpp
diff --git a/Source/platform/scroll/ScrollableArea.cpp b/Source/platform/scroll/ScrollableArea.cpp
index af06540c5bcd3a037411713aa75eaa5027163db2..93255a2f630780614c4264c3067d4fa14e230df6 100644
--- a/Source/platform/scroll/ScrollableArea.cpp
+++ b/Source/platform/scroll/ScrollableArea.cpp
@@ -208,7 +208,12 @@ bool ScrollableArea::scrollBehaviorFromString(const String& behaviorString, Scro
 
 bool ScrollableArea::handleWheelEvent(const PlatformWheelEvent& wheelEvent)
 {
-    return scrollAnimator()->handleWheelEvent(wheelEvent);
+    return handleWheelEvent(wheelEvent, true, true);
+}
+
+bool ScrollableArea::handleWheelEvent(const PlatformWheelEvent& wheelEvent, bool canRubberbandLeft, bool canRubberbandRight)
+{
+    return scrollAnimator()->handleWheelEvent(wheelEvent, canRubberbandLeft, canRubberbandRight);
 }
 
 // NOTE: Only called from Internals for testing.