Add OnDisplayMetricsChanged in DisplayObserver.

ash/wm/overview/window_overview.cc

 // Copyright 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 "ash/wm/overview/window_overview.h"
 
 #include <algorithm>
 
 #include "ash/accessibility_delegate.h"
 #include "ash/metrics/user_metrics_recorder.h"
@@ skipping 280 matching lines @@
 
   // TODO(flackr): StopPropogation prevents generation of gesture events.
   // We should find a better way to prevent events from being delivered to
   // the window, perhaps a transparent window in front of the target window
   // or using EventClientImpl::CanProcessEventsWithinSubtree and then a tap
   // gesture could be used to activate the window.
   event->SetHandled();
   window_selector_->SelectWindow(target);
 }
 
-void WindowOverview::OnDisplayBoundsChanged(const gfx::Display& display) {
-  PositionWindows(/* animate */ false);
-}
-
 void WindowOverview::OnDisplayAdded(const gfx::Display& display) {
 }
 
 void WindowOverview::OnDisplayRemoved(const gfx::Display& display) {
 }
 
+void WindowOverview::OnDisplayMetricsChanged(
+    const gfx::Display& display,
+    gfx::DisplayObserver::DisplayMetrics metrics) {
+  PositionWindows(/* animate */ false);
+}
+
 aura::Window* WindowOverview::GetEventTarget(ui::LocatedEvent* event) {
   aura::Window* target = static_cast<aura::Window*>(event->target());
   // If the target window doesn't actually contain the event location (i.e.
   // mouse down over the window and mouse up elsewhere) then do not select the
   // window.
   if (!target->ContainsPoint(event->location()))
     return NULL;
 
   return GetTargetedWindow(target);
 }
@@ skipping 127 matching lines @@
 }
 
 gfx::Rect WindowOverview::GetSelectionBounds(size_t index) {
   gfx::Rect bounds((*windows_)[index]->bounds());
   bounds.Inset(-kWindowOverviewSelectionPadding,
                -kWindowOverviewSelectionPadding);
   return bounds;
 }
 
 }  // namespace ash