Add OnDisplayMetricsChanged in DisplayObserver.

ash/touch/touch_observer_hud.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 "ash/touch/touch_observer_hud.h"
 
 #include "ash/root_window_controller.h"
 #include "ash/root_window_settings.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
@@ skipping 68 matching lines @@
 }
 
 void TouchObserverHUD::OnTouchEvent(ui::TouchEvent* /*event*/) {
 }
 
 void TouchObserverHUD::OnWidgetDestroying(views::Widget* widget) {
   DCHECK_EQ(widget, widget_);
   delete this;
 }
 
-void TouchObserverHUD::OnDisplayBoundsChanged(const gfx::Display& display) {
-  if (display.id() != display_id_)
-    return;
-  widget_->SetSize(display.size());
-}
-
 void TouchObserverHUD::OnDisplayAdded(const gfx::Display& new_display) {}
 
 void TouchObserverHUD::OnDisplayRemoved(const gfx::Display& old_display) {
   if (old_display.id() != display_id_)
     return;
   widget_->CloseNow();
 }
 
+void TouchObserverHUD::OnDisplayMetricsChanged(
+    const gfx::Display& display, DisplayObserver::MetricsType metrics) {
+  if (display.id() != display_id_ || !(metrics & DISPLAY_METRICS_BOUNDS))
+    return;
+
+  widget_->SetSize(display.size());
+}
+
 #if defined(OS_CHROMEOS)
 void TouchObserverHUD::OnDisplayModeChanged(
     const ui::DisplayConfigurator::DisplayStateList& outputs) {
   // Clear touch HUD for any change in display mode (single, dual extended, dual
   // mirrored, ...).
   Clear();
 }
 #endif  // defined(OS_CHROMEOS)
 
 void TouchObserverHUD::OnDisplaysInitialized() {
@@ skipping 28 matching lines @@
       widget_->GetNativeView(),
       Shell::GetContainer(root_window_, kShellWindowId_OverlayContainer));
 
   RootWindowController* controller = GetRootWindowController(root_window_);
   SetHudForRootWindowController(controller);
 
   root_window_->AddPreTargetHandler(this);
 }
 
 }  // namespace ash