Add ScrollDirectionPhysical enum in Scroll types.

Source/web/WebPluginContainerImpl.cpp

Index: Source/web/WebPluginContainerImpl.cpp
diff --git a/Source/web/WebPluginContainerImpl.cpp b/Source/web/WebPluginContainerImpl.cpp
index 7057f128c57690eb3cbadea8dd5d837515d24557..91bb6469224ceae80ddcd7d977298f5372727d01 100644
--- a/Source/web/WebPluginContainerImpl.cpp
+++ b/Source/web/WebPluginContainerImpl.cpp
@@ -922,7 +922,7 @@ void WebPluginContainerImpl::handleTouchEvent(TouchEvent* event)
     }
 }
 
-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;
@@ -946,9 +946,9 @@ void WebPluginContainerImpl::handleGestureEvent(GestureEvent* event)
     if (webEvent.type == WebInputEvent::GestureScrollUpdate) {
         if (!m_scrollbarGroup)
             return;
-        if (gestureScrollHelper(m_scrollbarGroup.get(), ScrollLeft, ScrollRight, webEvent.data.scrollUpdate.deltaX))
+        if (gestureScrollHelper(m_scrollbarGroup.get(), ScrollPhysicalLeft, ScrollPhysicalRight, webEvent.data.scrollUpdate.deltaX))
             event->setDefaultHandled();
-        if (gestureScrollHelper(m_scrollbarGroup.get(), ScrollUp, ScrollDown, webEvent.data.scrollUpdate.deltaY))
+        if (gestureScrollHelper(m_scrollbarGroup.get(), ScrollPhysicalUp, ScrollPhysicalDown, webEvent.data.scrollUpdate.deltaY))
             event->setDefaultHandled();
     }
     // FIXME: Can a plugin change the cursor from a touch-event callback?