Add ScrollDirectionPhysical enum in Scroll types.

Source/web/WebPluginScrollbarImpl.cpp

Index: Source/web/WebPluginScrollbarImpl.cpp
diff --git a/Source/web/WebPluginScrollbarImpl.cpp b/Source/web/WebPluginScrollbarImpl.cpp
index 3b136b784d54369e314910ae5496743a526ddeb7..dd35e273116ac8186008f58910352b14a3781212 100644
--- a/Source/web/WebPluginScrollbarImpl.cpp
+++ b/Source/web/WebPluginScrollbarImpl.cpp
@@ -217,12 +217,12 @@ void WebPluginScrollbarImpl::setDocumentSize(int size)
 
 void WebPluginScrollbarImpl::scroll(ScrollDirection direction, ScrollGranularity granularity, float multiplier)
 {
-    blink::ScrollDirection dir;
+    blink::ScrollDirectionPhysical dir;
     bool horizontal = m_scrollbar->orientation() == HorizontalScrollbar;
     if (direction == ScrollForward)
-        dir = horizontal ? ScrollRight : ScrollDown;
+        dir = horizontal ? ScrollPhysicalRight : ScrollPhysicalDown;
     else
-        dir = horizontal ? ScrollLeft : ScrollUp;
+        dir = horizontal ? ScrollPhysicalLeft : ScrollPhysicalUp;
 
     m_group->scroll(dir, static_cast<blink::ScrollGranularity>(granularity), multiplier);
 }
@@ -358,7 +358,7 @@ bool WebPluginScrollbarImpl::onKeyDown(const WebInputEvent& event)
     blink::ScrollGranularity scrollGranularity;
     if (WebViewImpl::mapKeyCodeForScroll(keyCode, &scrollDirection, &scrollGranularity)) {
         // Will return false if scroll direction wasn't compatible with this scrollbar.
-        return m_group->scroll(scrollDirection, scrollGranularity);
+        return m_group->scroll(toPhysicalDirection(scrollDirection, true, true), scrollGranularity);

[bokan, 2015/05/21 18:54:43]

I'd rather make WebViewImpl::mapKeyCodeForScroll use a ScrollDirectionPhysical.
You'll have to also update WebViewImpl::scrollViewWithKeyboard  which is the
other caller of mapKeyCodeForScroll. That method calls
EventHandler::bubblingScroll which takes ScrollDirection so I'd add a
toScrollDirection function that converts a PhysicalScrollDirection to The
ScrollLeft/Right/UpDown enums of ScrollDirection.

     }
     return false;
 }