Add kAccessibilityFocusFallsbackToWidget property

ui/views/bubble/bubble_dialog_delegate.cc

 // Copyright 2016 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/bubble/bubble_dialog_delegate.h"
 
 #include "build/build_config.h"
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/color_utils.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/native_theme/native_theme.h"
 #include "ui/views/bubble/bubble_frame_view.h"
 #include "ui/views/focus/view_storage.h"
 #include "ui/views/layout/layout_constants.h"
+#include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_observer.h"
 #include "ui/views/window/dialog_client_view.h"
 
 #if defined(OS_WIN)
 #include "ui/base/win/shell.h"
 #endif
 
 namespace views {
 
 namespace {
 
 // Create a widget to host the bubble.
 Widget* CreateBubbleWidget(BubbleDialogDelegateView* bubble) {
   Widget* bubble_widget = new Widget();
   Widget::InitParams bubble_params(Widget::InitParams::TYPE_BUBBLE);
   bubble_params.delegate = bubble;
   bubble_params.opacity = Widget::InitParams::TRANSLUCENT_WINDOW;
   bubble_params.accept_events = bubble->accept_events();
   if (bubble->parent_window())
     bubble_params.parent = bubble->parent_window();
   else if (bubble->anchor_widget())
     bubble_params.parent = bubble->anchor_widget()->GetNativeView();
   bubble_params.activatable = bubble->CanActivate()
                                   ? Widget::InitParams::ACTIVATABLE_YES
                                   : Widget::InitParams::ACTIVATABLE_NO;
   bubble->OnBeforeBubbleWidgetInit(&bubble_params, bubble_widget);
   bubble_widget->Init(bubble_params);
+
+  View* root_view = bubble_widget->GetRootView();
+  if (root_view != nullptr)
+    root_view->SetFocusBehavior(View::FocusBehavior::ACCESSIBLE_ONLY);
+
   if (bubble_params.parent)
     bubble_widget->StackAbove(bubble_params.parent);
   return bubble_widget;
 }
 
 }  // namespace
 
 // static
 const char BubbleDialogDelegateView::kViewClassName[] =
     "BubbleDialogDelegateView";
@@ skipping 264 matching lines @@
   // http://crbug.com/474622 for details.
   if (widget == GetWidget() && visible) {
     ui::AXNodeData node_data;
     GetAccessibleNodeData(&node_data);
     if (node_data.role == ui::AX_ROLE_ALERT_DIALOG)
       NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
   }
 }
 
 }  // namespace views