Add ContextMenuSourceType to views::ContextMenuController::ShowContextMenuForView.

ui/views/controls/scrollbar/base_scroll_bar.cc

Index: ui/views/controls/scrollbar/base_scroll_bar.cc
diff --git a/ui/views/controls/scrollbar/base_scroll_bar.cc b/ui/views/controls/scrollbar/base_scroll_bar.cc
index 64b1d13a06edf9f464890403513d0c680079eac5..0e684be831e96a86bd3981aee67b75381f9c6215 100644
--- a/ui/views/controls/scrollbar/base_scroll_bar.cc
+++ b/ui/views/controls/scrollbar/base_scroll_bar.cc
@@ -273,7 +273,10 @@ enum ScrollBarContextMenuCommands {
   ScrollBarContextMenuCommand_ScrollNext
 };
 
-void BaseScrollBar::ShowContextMenuForView(View* source, const gfx::Point& p) {
+void BaseScrollBar::ShowContextMenuForView(
+    View* source,
+    const gfx::Point& p,
+    ui::ContextMenuSourceType source_type) {
   Widget* widget = GetWidget();
   gfx::Rect widget_bounds = widget->GetWindowBoundsInScreen();
   gfx::Point temp_pt(p.x() - widget_bounds.x(), p.y() - widget_bounds.y());
@@ -293,8 +296,9 @@ void BaseScrollBar::ShowContextMenuForView(View* source, const gfx::Point& p) {
   menu->AppendSeparator();
   menu->AppendDelegateMenuItem(ScrollBarContextMenuCommand_ScrollPrev);
   menu->AppendDelegateMenuItem(ScrollBarContextMenuCommand_ScrollNext);
-  if (menu_runner_->RunMenuAt(GetWidget(), NULL, gfx::Rect(p, gfx::Size()),
-          MenuItemView::TOPLEFT, MenuRunner::HAS_MNEMONICS |
+  if (menu_runner_->RunContextMenuAt(GetWidget(), NULL,
+          gfx::Rect(p, gfx::Size()),
+          source_type, MenuRunner::HAS_MNEMONICS |
           views::MenuRunner::CONTEXT_MENU) ==
       MenuRunner::MENU_DELETED)
     return;