Add ContextMenuSourceType to views::ContextMenuController::ShowContextMenuForView.

ash/root_window_controller.cc

Index: ash/root_window_controller.cc
diff --git a/ash/root_window_controller.cc b/ash/root_window_controller.cc
index 78cf2083a8add176a742d2ca3e8b6b074e75f291..61a90e3aa09d6331e00afb5624e7fb5a198c977f 100644
--- a/ash/root_window_controller.cc
+++ b/ash/root_window_controller.cc
@@ -414,7 +414,8 @@ SystemTray* RootWindowController::GetSystemTray() {
 }
 
 void RootWindowController::ShowContextMenu(
-    const gfx::Point& location_in_screen) {
+    const gfx::Point& location_in_screen,
+    ui::ContextMenuSourceType source_type) {
   DCHECK(Shell::GetInstance()->delegate());
   scoped_ptr<ui::MenuModel> menu_model(
       Shell::GetInstance()->delegate()->CreateContextMenu(root_window()));
@@ -429,9 +430,9 @@ void RootWindowController::ShowContextMenu(
     return;
 
   views::MenuRunner menu_runner(menu_model.get());
-  if (menu_runner.RunMenuAt(background->widget(),
+  if (menu_runner.RunContextMenuAt(background->widget(),
           NULL, gfx::Rect(location_in_screen, gfx::Size()),
-          views::MenuItemView::TOPLEFT, views::MenuRunner::CONTEXT_MENU) ==
+          source_type, views::MenuRunner::CONTEXT_MENU) ==
       views::MenuRunner::MENU_DELETED) {
     return;
   }