Do not activate system tray bubble by default

ash/common/system/tray/system_tray_bubble.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 "ash/common/system/tray/system_tray_bubble.h"
 
 #include <utility>
 #include <vector>
 
 #include "ash/common/material_design/material_design_controller.h"
@@ skipping 195 matching lines @@
   }
 }
 
 void SystemTrayBubble::FocusDefaultIfNeeded() {
   views::FocusManager* manager = bubble_view_->GetFocusManager();
   if (!manager || manager->GetFocusedView())
     return;
 
   views::View* view =
       manager->GetNextFocusableView(nullptr, nullptr, false, false);
-  if (view)
+  // TODO(oshima): RequestFocus calls View::OnFocus even if the widget
+  // is not active (crbug.com/621791). Remove this check once the bug
+  // is fixed.
+  if (bubble_view_->GetWidget()->IsActive()) {
     view->RequestFocus();
+  } else {
+    manager->SetStoredFocusView(view);
+  }
 }
 
 void SystemTrayBubble::DestroyItemViews() {
   for (std::vector<ash::SystemTrayItem*>::iterator it = items_.begin();
        it != items_.end(); ++it) {
     switch (bubble_type_) {
       case BUBBLE_TYPE_DEFAULT:
         (*it)->DestroyDefaultView();
         break;
       case BUBBLE_TYPE_DETAILED:
@@ skipping 112 matching lines @@
     if (is_default_bubble) {
       const int last_item_with_border =
           static_cast<int>(item_containers.size()) - 2;
       for (int i = 0; i < last_item_with_border; ++i) {
         item_containers.at(i)->SetBorder(views::Border::CreateSolidSidedBorder(
             0, 0, 1, 0, kBorderLightColor));
       }
     }
   }
 
-  if (focus_view)
+  if (focus_view) {
+    tray_->ActivateBubble();
     focus_view->RequestFocus();
+  }
 }
 
 }  // namespace ash