Allow postponed rail application for touch scrolling - blink side.

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 2551 matching lines @@
     } else {
         if (m_frame->isMainFrame())
             m_frame->host()->topControls().scrollBegin();
     }
     return true;
 }
 
 bool EventHandler::handleGestureScrollUpdate(const PlatformGestureEvent& gestureEvent)
 {
     ASSERT(gestureEvent.type() == PlatformEvent::GestureScrollUpdate);
-
-    FloatSize delta(gestureEvent.deltaX(), gestureEvent.deltaY());
+    bool ignoreX = gestureEvent.railsMode() == PlatformEvent::RailsModeVertical;
+    bool ignoreY = gestureEvent.railsMode() == PlatformEvent::RailsModeHorizontal;
+    FloatSize delta(ignoreX ? 0 : gestureEvent.deltaX(),
+        ignoreY ? 0 : gestureEvent.deltaY());
+    FloatSize velocity(ignoreX ? 0 : gestureEvent.velocityX(),
+        ignoreY ? 0 : gestureEvent.velocityY());
     if (delta.isZero())
         return false;
 
     Node* node = m_scrollGestureHandlingNode.get();
     if (node) {
         LayoutObject* renderer = node->layoutObject();
         if (!renderer)
             return false;
 
         RefPtrWillBeRawPtr<FrameView> protector(m_frame->view());
@@ skipping 10 matching lines @@
             }
             // FIXME: we should allow simultaneous scrolling of nested
             // iframes along perpendicular axes. See crbug.com/466991.
             m_deltaConsumedForScrollSequence = true;
             return true;
         }
 
         bool scrolled = false;
         if (RuntimeEnabledFeatures::scrollCustomizationEnabled()) {
             RefPtrWillBeRawPtr<ScrollState> scrollState = ScrollState::create(
-                gestureEvent.deltaX(), gestureEvent.deltaY(),
-                0, gestureEvent.velocityX(), gestureEvent.velocityY(),
+                delta.width(), delta.height(),
+                0, velocity.width(), velocity.height(),
                 gestureEvent.inertial(), /* isBeginning */
                 false, /* isEnding */ false, /* fromUserInput */ true,
                 !gestureEvent.preventPropagation(), m_deltaConsumedForScrollSequence);
             if (m_previousGestureScrolledNode) {
                 // The ScrollState needs to know what the current
                 // native scrolling element is, so that for an
                 // inertial scroll that shouldn't propagate, only the
                 // currently scrolling element responds.
                 ASSERT(m_previousGestureScrolledNode->isElementNode());
                 scrollState->setCurrentNativeScrollingElement(toElement(m_previousGestureScrolledNode.get()));
@@ skipping 1379 matching lines @@
 unsigned EventHandler::accessKeyModifiers()
 {
 #if OS(MACOSX)
     return PlatformEvent::CtrlKey | PlatformEvent::AltKey;
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace blink