Allow menus to stay open during a child view's drag and drop

ui/views/widget/widget.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/widget/widget.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 769 matching lines @@
 ui::InputMethod* Widget::GetHostInputMethod() {
   return native_widget_private()->GetHostInputMethod();
 }
 
 void Widget::RunShellDrag(View* view,
                           const ui::OSExchangeData& data,
                           const gfx::Point& location,
                           int operation,
                           ui::DragDropTypes::DragEventSource source) {
   dragged_view_ = view;
+  OnDragWillStart();
   native_widget_->RunShellDrag(view, data, location, operation, source);
   // If the view is removed during the drag operation, dragged_view_ is set to
   // NULL.
   if (view && dragged_view_ == view) {
     dragged_view_ = NULL;
     view->OnDragDone();
   }
+  OnDragComplete();
 }
 
 void Widget::SchedulePaintInRect(const gfx::Rect& rect) {
   native_widget_->SchedulePaintInRect(rect);
 }
 
 void Widget::SetCursor(gfx::NativeCursor cursor) {
   native_widget_->SetCursor(cursor);
 }
 
@@ skipping 568 matching lines @@
   return new internal::RootView(this);
 }
 
 void Widget::DestroyRootView() {
   non_client_view_ = NULL;
   root_view_.reset();
   // Input method has to be destroyed before focus manager.
   input_method_.reset();
 }
 
+void Widget::OnDragWillStart() {
+}
+
+void Widget::OnDragComplete() {
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // Widget, private:
 
 void Widget::SetInactiveRenderingDisabled(bool value) {
   if (value == disable_inactive_rendering_)
     return;
 
   disable_inactive_rendering_ = value;
   if (non_client_view_)
     non_client_view_->SetInactiveRenderingDisabled(value);
@@ skipping 98 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // internal::NativeWidgetPrivate, NativeWidget implementation:
 
 internal::NativeWidgetPrivate* NativeWidgetPrivate::AsNativeWidgetPrivate() {
   return this;
 }
 
 }  // namespace internal
 }  // namespace views