Implement CSSOM Smooth Scroll API

Source/core/html/HTMLBodyElement.cpp

Index: Source/core/html/HTMLBodyElement.cpp
diff --git a/Source/core/html/HTMLBodyElement.cpp b/Source/core/html/HTMLBodyElement.cpp
index 432291ae51024ba444c26b9aa5e9c765475afcff..c6d886fb97a5463e5c79f58a3c458cbcfe5d1f07 100644
--- a/Source/core/html/HTMLBodyElement.cpp
+++ b/Source/core/html/HTMLBodyElement.cpp
@@ -239,7 +239,7 @@ int HTMLBodyElement::scrollLeft()
     return view ? adjustForZoom(view->scrollX(), &document) : 0;
 }
 
-void HTMLBodyElement::setScrollLeft(int scrollLeft)
+void HTMLBodyElement::setScrollLeftInternal(int scrollLeft, ScrollBehavior scrollBehavior)
 {
     Document& document = this->document();
     document.updateLayoutIgnorePendingStylesheets();
@@ -250,7 +250,7 @@ void HTMLBodyElement::setScrollLeft(int scrollLeft)
             return;
         if (render->hasOverflowClip()) {
             // FIXME: Investigate how are other browsers casting to int (rounding, ceiling, ...).
-            render->setScrollLeft(static_cast<int>(scrollLeft * render->style()->effectiveZoom()));
+            render->setScrollLeft(static_cast<int>(scrollLeft * render->style()->effectiveZoom()), scrollBehavior);
             return;
         }
         if (!document.inQuirksMode())
@@ -263,7 +263,7 @@ void HTMLBodyElement::setScrollLeft(int scrollLeft)
     FrameView* view = frame->view();
     if (!view)
         return;
-    view->setScrollPosition(IntPoint(static_cast<int>(scrollLeft * frame->pageZoomFactor()), view->scrollY()));
+    view->setScrollPosition(IntPoint(static_cast<int>(scrollLeft * frame->pageZoomFactor()), view->scrollY()), scrollBehavior);
 }
 
 int HTMLBodyElement::scrollTop()
@@ -285,7 +285,7 @@ int HTMLBodyElement::scrollTop()
     return view ? adjustForZoom(view->scrollY(), &document) : 0;
 }
 
-void HTMLBodyElement::setScrollTop(int scrollTop)
+void HTMLBodyElement::setScrollTopInternal(int scrollTop, ScrollBehavior scrollBehavior)
 {
     Document& document = this->document();
     document.updateLayoutIgnorePendingStylesheets();
@@ -296,7 +296,7 @@ void HTMLBodyElement::setScrollTop(int scrollTop)
             return;
         if (render->hasOverflowClip()) {
             // FIXME: Investigate how are other browsers casting to int (rounding, ceiling, ...).
-            render->setScrollTop(static_cast<int>(scrollTop * render->style()->effectiveZoom()));
+            render->setScrollTop(static_cast<int>(scrollTop * render->style()->effectiveZoom()), scrollBehavior);
             return;
         }
         if (!document.inQuirksMode())
@@ -309,7 +309,7 @@ void HTMLBodyElement::setScrollTop(int scrollTop)
     FrameView* view = frame->view();
     if (!view)
         return;
-    view->setScrollPosition(IntPoint(view->scrollX(), static_cast<int>(scrollTop * frame->pageZoomFactor())));
+    view->setScrollPosition(IntPoint(view->scrollX(), static_cast<int>(scrollTop * frame->pageZoomFactor())), scrollBehavior);
 }
 
 int HTMLBodyElement::scrollHeight()