Selectively disable rubber banding on mac.

Source/core/page/EventHandler.cpp

Index: Source/core/page/EventHandler.cpp
diff --git a/Source/core/page/EventHandler.cpp b/Source/core/page/EventHandler.cpp
index f32a579c0cb86dbe09e7a2250c02e1d1e726b4f3..48755762e58ad673a712f24fdebb0e1df84e05f1 100644
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -24,7 +24,6 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
-
 #include "config.h"
 #include "core/page/EventHandler.h"
 
@@ -2114,7 +2113,7 @@ bool EventHandler::shouldTurnVerticalTicksIntoHorizontal(const HitTestResult& re
 #endif
 }
 
-bool EventHandler::handleWheelEvent(const PlatformWheelEvent& e)
+bool EventHandler::handleWheelEvent(const PlatformWheelEvent& e, bool canRubberbandLeft, bool canRubberbandRight)
 {
 #define RETURN_WHEEL_EVENT_HANDLED() \
     { \
@@ -2178,8 +2177,9 @@ bool EventHandler::handleWheelEvent(const PlatformWheelEvent& e)
 
         if (isOverWidget && target && target->isWidget()) {
             Widget* widget = toRenderWidget(target)->widget();
-            if (widget && passWheelEventToWidget(e, widget))
+            if (widget && passWheelEventToWidget(e, widget, canRubberbandLeft, canRubberbandRight)) {
                 RETURN_WHEEL_EVENT_HANDLED();
+            }
         }
 
         if (node && !node->dispatchWheelEvent(event))
@@ -2195,7 +2195,7 @@ bool EventHandler::handleWheelEvent(const PlatformWheelEvent& e)
 
     // We do another check on the frame view because the event handler can run JS which results in the frame getting destroyed.
     view = m_frame->view();
-    if (!view || !view->wheelEvent(event))
+    if (!view || !view->wheelEvent(event, canRubberbandLeft, canRubberbandRight))
         return false;
 
     RETURN_WHEEL_EVENT_HANDLED();
@@ -2650,7 +2650,7 @@ bool EventHandler::sendScrollEventToView(const PlatformGestureEvent& gestureEven
         gestureEvent.shiftKey(), gestureEvent.ctrlKey(), gestureEvent.altKey(), gestureEvent.metaKey());
     syntheticWheelEvent.setHasPreciseScrollingDeltas(true);
 
-    bool scrolledFrame = view->wheelEvent(syntheticWheelEvent);
+    bool scrolledFrame = view->wheelEvent(syntheticWheelEvent, true, true);
     if (scrolledFrame)
         setFrameWasScrolledByUser();
 
@@ -3987,7 +3987,7 @@ bool EventHandler::passMouseReleaseEventToSubframe(MouseEventWithHitTestResults&
     return true;
 }
 
-bool EventHandler::passWheelEventToWidget(const PlatformWheelEvent& wheelEvent, Widget* widget)
+bool EventHandler::passWheelEventToWidget(const PlatformWheelEvent& wheelEvent, Widget* widget, bool canRubberbandLeft, bool canRubberbandRight)
 {
     // We can sometimes get a null widget!  EventHandlerMac handles a null
     // widget by returning false, so we do the same.
@@ -3999,7 +3999,7 @@ bool EventHandler::passWheelEventToWidget(const PlatformWheelEvent& wheelEvent,
     if (!widget->isFrameView())
         return false;
 
-    return toFrameView(widget)->frame().eventHandler().handleWheelEvent(wheelEvent);
+    return toFrameView(widget)->frame().eventHandler().handleWheelEvent(wheelEvent, canRubberbandLeft, canRubberbandRight);
 }
 
 bool EventHandler::passWidgetMouseDownEventToWidget(const MouseEventWithHitTestResults& event)