ash: Avoid treating screen resizes as user activity.

ash/display/display_change_observer_chromeos.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/display/display_change_observer_chromeos.h"
 
 #include <algorithm>
 #include <map>
 #include <set>
 #include <vector>
 
 #include "ash/ash_switches.h"
 #include "ash/display/display_info.h"
 #include "ash/display/display_layout_store.h"
 #include "ash/display/display_manager.h"
 #include "ash/shell.h"
 #include "ash/touch/touchscreen_util.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "grit/ash_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/compositor/dip_util.h"
 #include "ui/display/types/chromeos/display_mode.h"
 #include "ui/display/types/chromeos/display_snapshot.h"
 #include "ui/display/util/display_util.h"
 #include "ui/events/device_data_manager.h"
 #include "ui/events/touchscreen_device.h"
 #include "ui/gfx/display.h"
+#include "ui/wm/core/user_activity_detector.h"
 
 namespace ash {
 
 using ui::DisplayConfigurator;
 
 namespace {
 
 // The DPI threshold to determine the device scale factor.
 // DPI higher than |dpi| will use |device_scale_factor|.
 struct DeviceScaleFactorDPIThreshold {
@@ skipping 200 matching lines @@
     new_info.set_available_color_profiles(
         Shell::GetInstance()
             ->display_configurator()
             ->GetAvailableColorCalibrationProfiles(id));
   }
 
   AssociateTouchscreens(
       &displays, ui::DeviceDataManager::GetInstance()->touchscreen_devices());
   // DisplayManager can be null during the boot.
   Shell::GetInstance()->display_manager()->OnNativeDisplaysChanged(displays);
+
+  // For the purposes of user activity detection, ignore synthetic mouse events
+  // that are triggered by screen resizes: http://crbug.com/360634
+  ::wm::UserActivityDetector* user_activity_detector =
+      Shell::GetInstance()->user_activity_detector();
+  if (user_activity_detector)
+    user_activity_detector->OnDisplayPowerChanging();
 }
 
 void DisplayChangeObserver::OnAppTerminating() {
 #if defined(USE_ASH)
   // Stop handling display configuration events once the shutdown
   // process starts. crbug.com/177014.
   Shell::GetInstance()->display_configurator()->PrepareForExit();
 #endif
 }
 
@@ skipping 23 matching lines @@
     display_infos.push_back(display);
   }
 
   AssociateTouchscreens(
       &display_infos,
       ui::DeviceDataManager::GetInstance()->touchscreen_devices());
   display_manager->OnNativeDisplaysChanged(display_infos);
 }
 
 }  // namespace ash