Add ContextMenuSourceType to views::ContextMenuController::ShowContextMenuForView.

ui/views/controls/tree/tree_view.cc

Index: ui/views/controls/tree/tree_view.cc
diff --git a/ui/views/controls/tree/tree_view.cc b/ui/views/controls/tree/tree_view.cc
index e60b9c0488b76d795a48e36a5e71360757391cdf..d5df30844f4fcfcb3d926e630943fdb8c3995d8b 100644
--- a/ui/views/controls/tree/tree_view.cc
+++ b/ui/views/controls/tree/tree_view.cc
@@ -380,10 +380,11 @@ void TreeView::OnGestureEvent(ui::GestureEvent* event) {
   }
 }
 
-void TreeView::ShowContextMenu(const gfx::Point& p, bool is_mouse_gesture) {
+void TreeView::ShowContextMenu(const gfx::Point& p,
+                               ui::ContextMenuSourceType source_type) {
   if (!model_)
     return;
-  if (is_mouse_gesture) {
+  if (source_type == ui::CONTEXT_MENU_SOURCE_MOUSE) {
     // Only invoke View's implementation (which notifies the
     // ContextMenuController) if over a node.
     gfx::Point local_point(p);
@@ -397,7 +398,7 @@ void TreeView::ShowContextMenu(const gfx::Point& p, bool is_mouse_gesture) {
     if (!bounds.Contains(local_point))
       return;
   }
-  View::ShowContextMenu(p, is_mouse_gesture);
+  View::ShowContextMenu(p, source_type);
 }
 
 void TreeView::GetAccessibleState(ui::AccessibleViewState* state) {