Add ScrollDirectionPhysical enum in Scroll types.

Source/web/WebPluginContainerImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2014 Opera Software ASA. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 904 matching lines @@
             event->setDefaultHandled();
         // FIXME: Can a plugin change the cursor from a touch-event callback?
         return;
     }
     case TouchEventRequestTypeSynthesizedMouse:
         synthesizeMouseEventIfPossible(event);
         return;
     }
 }
 
-static inline bool gestureScrollHelper(ScrollbarGroup* scrollbarGroup, ScrollDirection positiveDirection, ScrollDirection negativeDirection, float delta)
+static inline bool gestureScrollHelper(ScrollbarGroup* scrollbarGroup, ScrollDirectionPhysical positiveDirection, ScrollDirectionPhysical negativeDirection, float delta)
 {
     if (!delta)
         return false;
     float absDelta = delta > 0 ? delta : -delta;
     return scrollbarGroup->scroll(delta < 0 ? negativeDirection : positiveDirection, ScrollByPrecisePixel, absDelta);
 }
 
 void WebPluginContainerImpl::handleGestureEvent(GestureEvent* event)
 {
     WebGestureEventBuilder webEvent(m_element->layoutObject(), *event);
@@ skipping 79 matching lines @@
     for (size_t i = 0; i < cutOutRects.size(); i++)
         cutOutRects[i].move(-frameRect().x(), -frameRect().y());
 }
 
 bool WebPluginContainerImpl::pluginShouldPersist() const
 {
     return m_webPlugin->shouldPersist();
 }
 
 } // namespace blink