Add OnDisplayMetricsChanged in DisplayObserver.

ui/message_center/views/message_popup_collection.cc

 // Copyright (c) 2013 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/message_popup_collection.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/i18n/rtl.h"
@@ skipping 543 matching lines @@
 void MessagePopupCollection::SetDisplayInfo(const gfx::Rect& work_area,
                                             const gfx::Rect& screen_bounds) {
   if (work_area_ == work_area)
     return;
 
   work_area_ = work_area;
   ComputePopupAlignment(work_area, screen_bounds);
   RepositionWidgets();
 }
 
-void MessagePopupCollection::OnDisplayBoundsChanged(
-    const gfx::Display& display) {
-  if (display.id() != display_id_)
-    return;
-
-  SetDisplayInfo(display.work_area(), display.bounds());
-}
-
 void MessagePopupCollection::OnDisplayAdded(const gfx::Display& new_display) {
 }
 
 void MessagePopupCollection::OnDisplayRemoved(const gfx::Display& old_display) {
   if (display_id_ == old_display.id() && !parent_) {
     gfx::Display display = gfx::Screen::GetNativeScreen()->GetPrimaryDisplay();
     display_id_ = display.id();
     SetDisplayInfo(display.work_area(), display.bounds());
   }
 }
 
+void MessagePopupCollection::OnDisplayMetricsChanged(
+    const gfx::Display& display, uint32_t metrics) {
+  if (display.id() != display_id_)
+    return;
+
+  if (metrics & DISPLAY_METRIC_BOUNDS || metrics & DISPLAY_METRIC_WORK_AREA)
+    SetDisplayInfo(display.work_area(), display.bounds());
+}
+
 views::Widget* MessagePopupCollection::GetWidgetForTest(const std::string& id)
     const {
   for (Toasts::const_iterator iter = toasts_.begin(); iter != toasts_.end();
        ++iter) {
     if ((*iter)->id() == id)
       return (*iter)->GetWidget();
   }
   return NULL;
 }
 
@@ skipping 15 matching lines @@
       views::Widget* widget = (*iter)->GetWidget();
       if (widget)
         return widget->GetWindowBoundsInScreen();
       break;
     }
   }
   return gfx::Rect();
 }
 
 }  // namespace message_center