Correctly restore fullscreen window bounds when leaving overview mode.

ash/common/wm/overview/window_selector.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/common/wm/overview/window_selector.h"
 
 #include <algorithm>
 #include <functional>
 #include <set>
 #include <utility>
@@ skipping 521 matching lines @@
 
 void WindowSelector::OnDisplayAdded(const display::Display& display) {}
 
 void WindowSelector::OnDisplayRemoved(const display::Display& display) {
   // TODO(flackr): Keep window selection active on remaining displays.
   CancelSelection();
 }
 
 void WindowSelector::OnDisplayMetricsChanged(const display::Display& display,
                                              uint32_t metrics) {
-  PositionWindows(/* animate */ false);
-  RepositionTextFilterOnDisplayMetricsChange();
+  // If only the work area changes, there is no need to reposition windows in
+  // overview.
+  if (metrics != DISPLAY_METRIC_WORK_AREA) {
+    PositionWindows(/* animate */ false);
+    RepositionTextFilterOnDisplayMetricsChange();
+  }
 }
 
 void WindowSelector::OnWindowTreeChanged(WmWindow* window,
                                          const TreeChangeParams& params) {
   // Only care about newly added children of |observed_windows_|.
   if (!observed_windows_.count(window) ||
       !observed_windows_.count(params.new_parent)) {
     return;
   }
 
@@ skipping 141 matching lines @@
   for (size_t i = 0; i <= grid_list_.size() &&
                      grid_list_[selected_grid_index_]->Move(direction, animate);
        i++) {
     selected_grid_index_ =
         (selected_grid_index_ + display_direction + grid_list_.size()) %
         grid_list_.size();
   }
 }
 
 }  // namespace ash