Align the base of the shelf's context menu to the top edge of the shelf.

ui/views/controls/menu/menu_runner.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/controls/menu/menu_runner.h"
 
 #include <utility>
 
 #include "ui/views/controls/menu/menu_runner_handler.h"
 #include "ui/views/controls/menu/menu_runner_impl.h"
@@ skipping 46 matching lines @@
     switch (source_type) {
       case ui::MENU_SOURCE_NONE:
       case ui::MENU_SOURCE_KEYBOARD:
       case ui::MENU_SOURCE_MOUSE:
         anchor = MENU_ANCHOR_TOPLEFT;
         break;
       case ui::MENU_SOURCE_TOUCH:
       case ui::MENU_SOURCE_TOUCH_EDIT_MENU:
         anchor = MENU_ANCHOR_BOTTOMCENTER;
         break;
+      case ui::MENU_SOURCE_TOUCH_SIDE_ANCHOR:
+        anchor = MENU_ANCHOR_SIDECENTER;
+        break;
+      case ui::MENU_SOURCE_TOUCH_BOTTOM_ANCHOR:
+        anchor = MENU_ANCHOR_FIXED_BOTTOMCENTER;
       default:
         break;
     }
   }
 
   impl_->RunMenuAt(parent, button, bounds, anchor, run_types_);
 }
 
 bool MenuRunner::IsRunning() const {
   return impl_->IsRunning();
 }
 
 void MenuRunner::Cancel() {
   impl_->Cancel();
 }
 
 base::TimeTicks MenuRunner::closing_event_time() const {
   return impl_->GetClosingEventTime();
 }
 
 void MenuRunner::SetRunnerHandler(
     std::unique_ptr<MenuRunnerHandler> runner_handler) {
   runner_handler_ = std::move(runner_handler);
 }
 
 }  // namespace views