Update StickyKeys overlay to show or hide AltGr depending on the

chrome/browser/chromeos/accessibility/accessibility_manager.cc

Index: chrome/browser/chromeos/accessibility/accessibility_manager.cc
diff --git a/chrome/browser/chromeos/accessibility/accessibility_manager.cc b/chrome/browser/chromeos/accessibility/accessibility_manager.cc
index aa7a0437d13f8278f9592306a2ee2a4dcb70ccf3..24d7e263524e05d10004fef71febcfff8094104e 100644
--- a/chrome/browser/chromeos/accessibility/accessibility_manager.cc
+++ b/chrome/browser/chromeos/accessibility/accessibility_manager.cc
@@ -323,6 +323,7 @@ AccessibilityManager::AccessibilityManager()
                               content::NotificationService::AllSources());
 
   GetBrailleController()->AddObserver(this);
+  input_method::InputMethodManager::Get()->AddObserver(this);
 
   ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
   media::SoundsManager* manager = media::SoundsManager::Get();
@@ -343,6 +344,7 @@ AccessibilityManager::~AccessibilityManager() {
       false,
       ash::A11Y_NOTIFICATION_NONE);
   NotifyAccessibilityStatusChanged(details);
+  input_method::InputMethodManager::Get()->RemoveObserver(this);
 }
 
 bool AccessibilityManager::ShouldShowAccessibilityMenu() {
@@ -753,6 +755,17 @@ void AccessibilityManager::ReceiveBrailleDisplayState(
   OnDisplayStateChanged(*state);
 }
 
+// Overridden from InputMethodManager::Observer.
+void AccessibilityManager::InputMethodChanged(
+    input_method::InputMethodManager* manager,
+    bool show_message) {
+#if defined(USE_ASH)
+  // Sticky keys is implemented only in ash.
+  ash::Shell::GetInstance()->sticky_keys_controller()->SetModifiersEnabled(
+      manager->IsMod3UsedByCurrentInputMethod(),
+      manager->IsAltGrUsedByCurrentInputMethod());
+#endif
+}
 
 void AccessibilityManager::SetProfile(Profile* profile) {
   pref_change_registrar_.reset();