Revert of Refactor backdrop

components/exo/wm_helper_ash.cc

Index: components/exo/wm_helper_ash.cc
diff --git a/components/exo/wm_helper_ash.cc b/components/exo/wm_helper_ash.cc
index e4b96bfd6ba09d42d6235e93ed9f3eceea341209..4474033ce1d21804ccfaf79e5244ca68b5e2e682 100644
--- a/components/exo/wm_helper_ash.cc
+++ b/components/exo/wm_helper_ash.cc
@@ -4,6 +4,7 @@
 
 #include "components/exo/wm_helper_ash.h"
 
+#include "ash/accessibility_delegate.h"
 #include "ash/public/cpp/config.h"
 #include "ash/shell.h"
 #include "ash/shell_port.h"
@@ -31,6 +32,7 @@
       aura::client::GetFocusClient(ash::Shell::GetPrimaryRootWindow());
   focus_client->AddObserver(this);
   ui::InputDeviceManager::GetInstance()->AddObserver(this);
+  ash::Shell::Get()->system_tray_notifier()->AddAccessibilityObserver(this);
 }
 
 WMHelperAsh::~WMHelperAsh() {
@@ -46,6 +48,7 @@
   ash::Shell::Get()->activation_client()->RemoveObserver(this);
   ash::Shell::Get()->RemoveShellObserver(this);
   ui::InputDeviceManager::GetInstance()->RemoveObserver(this);
+  ash::Shell::Get()->system_tray_notifier()->RemoveAccessibilityObserver(this);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -106,6 +109,14 @@
       ->IsMaximizeModeWindowManagerEnabled();
 }
 
+bool WMHelperAsh::IsSpokenFeedbackEnabled() const {
+  return ash::Shell::Get()->accessibility_delegate()->IsSpokenFeedbackEnabled();
+}
+
+void WMHelperAsh::PlayEarcon(int sound_key) const {
+  return ash::Shell::Get()->accessibility_delegate()->PlayEarcon(sound_key);
+}
+
 void WMHelperAsh::OnWindowActivated(
     aura::client::ActivationChangeObserver::ActivationReason reason,
     aura::Window* gained_active,
@@ -124,6 +135,11 @@
 
 void WMHelperAsh::OnCursorSetChanged(ui::CursorSetType cursor_set) {
   NotifyCursorSetChanged(cursor_set);
+}
+
+void WMHelperAsh::OnAccessibilityModeChanged(
+    ash::AccessibilityNotificationVisibility notify) {
+  NotifyAccessibilityModeChanged();
 }
 
 void WMHelperAsh::OnMaximizeModeStarted() {