Hide popup custom notifications on non-primary displays

ui/message_center/views/desktop_popup_alignment_delegate.cc

 // Copyright 2014 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/message_center/views/desktop_popup_alignment_delegate.h"
 
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/message_center/message_center_style.h"
@@ skipping 71 matching lines @@
       ? POPUP_ALIGNMENT_LEFT
       : POPUP_ALIGNMENT_RIGHT;
 }
 
 void DesktopPopupAlignmentDelegate::ConfigureWidgetInitParamsForContainer(
     views::Widget* widget,
     views::Widget::InitParams* init_params) {
   // Do nothing, which will use the default container.
 }
 
+bool DesktopPopupAlignmentDelegate::IsPrimaryDisplayForNotification() const {
+  return true;
+}
+
 // Anytime the display configuration changes, we need to recompute the alignment
 // on the primary display. But, we get different events on different platforms.
 // On Windows, for example, when switching from a laptop display to an external
 // monitor, we get a OnDisplayMetricsChanged() event. On Linux, we get a
 // OnDisplayRemoved() and a OnDisplayAdded() instead. In order to account for
 // these slightly different abstractions, we update on every event.
 void DesktopPopupAlignmentDelegate::UpdatePrimaryDisplay() {
   display::Display primary_display = screen_->GetPrimaryDisplay();
   if (primary_display.id() != primary_display_id_) {
     primary_display_id_ = primary_display.id();
@@ skipping 17 matching lines @@
 void DesktopPopupAlignmentDelegate::OnDisplayMetricsChanged(
     const display::Display& display,
     uint32_t metrics) {
   // Set to kInvalidDisplayId so the alignment is updated regardless of whether
   // the primary display actually changed.
   primary_display_id_ = display::kInvalidDisplayId;
   UpdatePrimaryDisplay();
 }
 
 }  // namespace message_center