MacViews: Support continuous scrolling and horizontal scrolling

ui/views/controls/scroll_view.cc

Index: ui/views/controls/scroll_view.cc
diff --git a/ui/views/controls/scroll_view.cc b/ui/views/controls/scroll_view.cc
index ec83c884ff54220b7550995092b4e8757d4d2d68..d12c73b0732f75d9f434970fc16038c2f7e15908 100644
--- a/ui/views/controls/scroll_view.cc
+++ b/ui/views/controls/scroll_view.cc
@@ -354,12 +354,12 @@ bool ScrollView::OnKeyPressed(const ui::KeyEvent& event) {
 
 bool ScrollView::OnMouseWheel(const ui::MouseWheelEvent& e) {
   bool processed = false;
-  // Give vertical scrollbar priority
+
   if (vert_sb_->visible())
     processed = vert_sb_->OnMouseWheel(e);
 
-  if (!processed && horiz_sb_->visible())
-    processed = horiz_sb_->OnMouseWheel(e);
+  if (horiz_sb_->visible())

[Andre, 2014/08/29 23:31:35]

BaseScrollBar::OnMouseWheel() always returns true so the horizontal scrollbar
never got a chance at the event.

+    processed = horiz_sb_->OnMouseWheel(e) || processed;
 
   return processed;
 }