Aura: Don't activate menus and other non-activatable widgets on drop

ui/views/widget/desktop_aura/desktop_native_widget_aura.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/desktop_aura/desktop_native_widget_aura.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/cursor_client.h"
@@ skipping 1122 matching lines @@
   return last_drop_operation_;
 }
 
 void DesktopNativeWidgetAura::OnDragExited() {
   DCHECK(drop_helper_.get() != NULL);
   drop_helper_->OnDragExit();
 }
 
 int DesktopNativeWidgetAura::OnPerformDrop(const ui::DropTargetEvent& event) {
   DCHECK(drop_helper_.get() != NULL);
-  Activate();
+  if (ShouldActivate())
+    Activate();
   return drop_helper_->OnDrop(event.data(), event.location(),
       last_drop_operation_);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopNativeWidgetAura, aura::WindowTreeHostObserver implementation:
 
 void DesktopNativeWidgetAura::OnHostCloseRequested(
     const aura::WindowTreeHost* host) {
   GetWidget()->Close();
@@ skipping 49 matching lines @@
   if (cursor_reference_count_ == 0) {
     // We are the last DesktopNativeWidgetAura instance, and we are responsible
     // for cleaning up |cursor_manager_|.
     delete cursor_manager_;
     native_cursor_manager_ = NULL;
     cursor_manager_ = NULL;
   }
 }
 
 }  // namespace views