exo: Initial support for multiple displays in ARC

components/exo/wm_helper.cc

 // Copyright 2016 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 "components/exo/wm_helper.h"
 
 #include "base/memory/ptr_util.h"
 
 namespace exo {
 namespace {
@@ skipping 61 matching lines @@
 
 void WMHelper::AddInputDeviceEventObserver(InputDeviceEventObserver* observer) {
   input_device_event_observers_.AddObserver(observer);
 }
 
 void WMHelper::RemoveInputDeviceEventObserver(
     InputDeviceEventObserver* observer) {
   input_device_event_observers_.RemoveObserver(observer);
 }
 
+void WMHelper::AddDisplayConfigurationObserver(
+    DisplayConfigurationObserver* observer) {
+  display_config_observers_.AddObserver(observer);
+}
+
+void WMHelper::RemoveDisplayConfigurationObserver(
+    DisplayConfigurationObserver* observer) {
+  display_config_observers_.RemoveObserver(observer);
+}
+
 void WMHelper::NotifyWindowActivated(aura::Window* gained_active,
                                      aura::Window* lost_active) {
   for (ActivationObserver& observer : activation_observers_)
     observer.OnWindowActivated(gained_active, lost_active);
 }
 
 void WMHelper::NotifyWindowFocused(aura::Window* gained_focus,
                                    aura::Window* lost_focus) {
   for (FocusObserver& observer : focus_observers_)
     observer.OnWindowFocused(gained_focus, lost_focus);
@@ skipping 27 matching lines @@
 void WMHelper::NotifyAccessibilityModeChanged() {
   for (AccessibilityObserver& observer : accessibility_observers_)
     observer.OnAccessibilityModeChanged();
 }
 
 void WMHelper::NotifyKeyboardDeviceConfigurationChanged() {
   for (InputDeviceEventObserver& observer : input_device_event_observers_)
     observer.OnKeyboardDeviceConfigurationChanged();
 }
 
+void WMHelper::NotifyDisplayConfigurationChanged() {
+  for (DisplayConfigurationObserver& observer : display_config_observers_)
+    observer.OnDisplayConfigurationChanged();
+}
+
 }  // namespace exo