Make shelf item can be dragged when context menu is opened.

ui/views/controls/menu/menu_controller.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_controller.h"
 
 #include "base/i18n/case_conversion.h"
 #include "base/i18n/rtl.h"
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 383 matching lines @@
 }
 
 MenuController::State::State(const State& other) = default;
 
 MenuController::State::~State() {}
 
 // MenuController ------------------------------------------------------------
 
 // static
 MenuController* MenuController::active_instance_ = NULL;
+bool MenuController::do_cancel_ = true;
 
 // static
 MenuController* MenuController::GetActiveInstance() {
   return active_instance_;
 }
 
 void MenuController::Run(Widget* parent,
                          MenuButton* button,
                          MenuItemView* root,
                          const gfx::Rect& bounds,
@@ skipping 399 matching lines @@
     // current menu is unset. Make sure the submenu remains open by sending the
     // appropriate SetSelectionTypes flags.
     SetSelection(part.menu->GetParentMenuItem(),
         SELECTION_OPEN_SUBMENU | SELECTION_UPDATE_IMMEDIATELY);
     event->StopPropagation();
   }
 
   if (event->stopped_propagation())
       return;
 
-  if (!part.submenu)
+  if (part.submenu) {
+    part.submenu->OnGestureEvent(event);
     return;
-  part.submenu->OnGestureEvent(event);
+  }
+
+  if (!DoCancel()) {
+    event->ConvertLocationToTarget(source->GetWidget()->GetNativeWindow(),
+                                   owner()->GetNativeWindow());
+    owner()->OnGestureEvent(event);
+  }
 }
 
 void MenuController::OnTouchEvent(SubmenuView* source, ui::TouchEvent* event) {
   if (event->type() == ui::ET_TOUCH_PRESSED) {
     MenuPart part = GetMenuPart(source, event->location());
     if (part.type == MenuPart::NONE) {
       RepostEventAndCancel(source, event);
       event->SetHandled();
     }
   }
@@ skipping 1878 matching lines @@
   if (hot_button_)
     hot_button_->SetHotTracked(false);
   hot_button_ = hot_button;
   if (hot_button) {
     hot_button->SetHotTracked(true);
     hot_button->NotifyAccessibilityEvent(ui::AX_EVENT_SELECTION, true);
   }
 }
 
 }  // namespace views