On some webpages, touch scrolling speed is too slow / fast

Source/core/page/EventHandler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 2399 matching lines @@
 
     return true;
 }
 
 bool EventHandler::handleGestureScrollUpdate(const PlatformGestureEvent& gestureEvent)
 {
     FloatSize delta(gestureEvent.deltaX(), gestureEvent.deltaY());
     if (delta.isZero())
         return false;
 
-    const float scaleFactor = m_frame->pageZoomFactor();
-    delta.scale(1 / scaleFactor, 1 / scaleFactor);
-
     Node* node = m_scrollGestureHandlingNode.get();
     if (!node)
         return sendScrollEventToView(gestureEvent, delta);
 
     // Ignore this event if the targeted node does not have a valid renderer.
     RenderObject* renderer = node->renderer();
     if (!renderer)
         return false;
 
     RefPtr<FrameView> protector(m_frame->view());
@@ skipping 22 matching lines @@
 
     if (horizontalScroll || verticalScroll) {
         setFrameWasScrolledByUser();
         return true;
     }
 
     // Otherwise try to scroll the view.
     return sendScrollEventToView(gestureEvent, delta);
 }
 
-bool EventHandler::sendScrollEventToView(const PlatformGestureEvent& gestureEvent, const FloatSize& scaledDelta)
+bool EventHandler::sendScrollEventToView(const PlatformGestureEvent& gestureEvent, const FloatSize& delta)
 {
     FrameView* view = m_frame->view();
     if (!view)
         return false;
 
     const float tickDivisor = static_cast<float>(WheelEvent::TickMultiplier);
     IntPoint point(gestureEvent.position().x(), gestureEvent.position().y());
     IntPoint globalPoint(gestureEvent.globalPosition().x(), gestureEvent.globalPosition().y());
     PlatformWheelEvent syntheticWheelEvent(point, globalPoint,
-        scaledDelta.width(), scaledDelta.height(),
-        scaledDelta.width() / tickDivisor, scaledDelta.height() / tickDivisor,
+        delta.width(), delta.height(),
+        delta.width() / tickDivisor, delta.height() / tickDivisor,
         ScrollByPixelWheelEvent,
         gestureEvent.shiftKey(), gestureEvent.ctrlKey(), gestureEvent.altKey(), gestureEvent.metaKey());
     syntheticWheelEvent.setHasPreciseScrollingDeltas(true);
 
     bool scrolledFrame = view->wheelEvent(syntheticWheelEvent);
     if (scrolledFrame)
         setFrameWasScrolledByUser();
 
     return scrolledFrame;
 }
@@ skipping 1381 matching lines @@
 unsigned EventHandler::accessKeyModifiers()
 {
 #if OS(MACOSX)
     return PlatformEvent::CtrlKey | PlatformEvent::AltKey;
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace blink