Defer focus handling to the content if it claims to have focus.

ui/arc/notification/arc_custom_notification_view.cc

Index: ui/arc/notification/arc_custom_notification_view.cc
diff --git a/ui/arc/notification/arc_custom_notification_view.cc b/ui/arc/notification/arc_custom_notification_view.cc
index ed6d8fd42fa260403f6500742b3b34b6f6d07795..a442bef4e149713f7990383d5165d1fba7d9a27f 100644
--- a/ui/arc/notification/arc_custom_notification_view.cc
+++ b/ui/arc/notification/arc_custom_notification_view.cc
@@ -17,6 +17,7 @@
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/transform.h"
 #include "ui/message_center/message_center_style.h"
+#include "ui/message_center/views/custom_notification_view.h"
 #include "ui/resources/grit/ui_resources.h"
 #include "ui/strings/grit/ui_strings.h"
 #include "ui/views/background.h"
@@ -178,6 +179,8 @@ ArcCustomNotificationView::ArcCustomNotificationView(
     : item_(item),
       notification_key_(item->notification_key()),
       event_forwarder_(new EventForwarder(this)) {
+  SetFocusBehavior(FocusBehavior::ALWAYS);
+
   item_->IncrementWindowRefCount();
   item_->AddObserver(this);
 
@@ -442,6 +445,18 @@ void ArcCustomNotificationView::OnMouseExited(const ui::MouseEvent&) {
   UpdateCloseButtonVisiblity();
 }
 
+void ArcCustomNotificationView::OnFocus() {
+  NativeViewHost::OnFocus();
+  static_cast<message_center::CustomNotificationView*>(parent())
+      ->OnContentFocused();
+}
+
+void ArcCustomNotificationView::OnBlur() {
+  NativeViewHost::OnBlur();
+  static_cast<message_center::CustomNotificationView*>(parent())
+      ->OnContentBlured();
+}
+
 void ArcCustomNotificationView::ButtonPressed(views::Button* sender,
                                               const ui::Event& event) {
   if (item_ && !item_->pinned() && sender == floating_close_button_) {