Add kAccessibilityFocusFallsbackToWidget property

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/logging.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 313 matching lines @@
     params.activatable = InitParams::ACTIVATABLE_NO;
   }
 
   widget_delegate_ = params.delegate ?
       params.delegate : new DefaultWidgetDelegate(this);
   widget_delegate_->set_can_activate(can_activate);
 
   ownership_ = params.ownership;
   native_widget_ = CreateNativeWidget(params, this)->AsNativeWidgetPrivate();
   root_view_.reset(CreateRootView());
+  root_view_->SetFocusBehavior(View::FocusBehavior::ACCESSIBLE_ONLY);

[sky, 2016/11/30 16:26:04]

Can you clarify why you want this? The change here means *every* widget will
have it's root view accessible. Many widgets are not activatable, or things you
wouldn't want to have focus (say tooltips for example). Many bubbles also don't
want focus. In other words this doesn't seem like the right change, but I could
be misunderstanding what this does and why you want it.

[yawano, 2016/12/01 00:24:23]

Added comment.

   default_theme_provider_.reset(new ui::DefaultThemeProvider);
   if (params.type == InitParams::TYPE_MENU) {
     is_mouse_button_pressed_ =
         internal::NativeWidgetPrivate::IsMouseButtonDown();
   }
   native_widget_->InitNativeWidget(params);
   if (RequiresNonClientView(params.type)) {
     non_client_view_ = new NonClientView;
     non_client_view_->SetFrameView(CreateNonClientFrameView());
     // Create the ClientView, add it to the NonClientView and add the
@@ skipping 1150 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // internal::NativeWidgetPrivate, NativeWidget implementation:
 
 internal::NativeWidgetPrivate* NativeWidgetPrivate::AsNativeWidgetPrivate() {
   return this;
 }
 
 }  // namespace internal
 }  // namespace views