Add ContextMenuSourceType to views::ContextMenuController::ShowContextMenuForView.

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 1cc177f5d9788b8c0760a9898641931c2e01a6a5..f917345b655f1dac34044fc2b3c1bf9d43dd925d 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -621,7 +621,8 @@ void Shell::Init() {
   }
 }
 
-void Shell::ShowContextMenu(const gfx::Point& location_in_screen) {
+void Shell::ShowContextMenu(const gfx::Point& location_in_screen,
+                            ui::ContextMenuSourceType source_type) {
   // No context menus if there is no session with an active user.
   if (!session_state_delegate_->NumberOfLoggedInUsers())
     return;
@@ -639,7 +640,7 @@ void Shell::ShowContextMenu(const gfx::Point& location_in_screen) {
   CHECK(rwc) << "root=" << root
              << ", location:" << location_in_screen.ToString();
   if (rwc)
-    rwc->ShowContextMenu(location_in_screen);
+    rwc->ShowContextMenu(location_in_screen, source_type);
 }
 
 void Shell::ToggleAppList(aura::Window* window) {