Update StickyKeys overlay to show or hide AltGr depending on the

ash/sticky_keys/sticky_keys_overlay.cc

 // Copyright 2014 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/sticky_keys/sticky_keys_overlay.h"
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/sticky_keys/sticky_keys_controller.h"
 #include "base/strings/string_util.h"
@@ skipping 112 matching lines @@
 
   virtual ~StickyKeysOverlayView();
 
   // views::WidgetDelegateView overrides:
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
 
   void SetKeyState(ui::EventFlags modifier, StickyKeyState state);
 
   StickyKeyState GetKeyState(ui::EventFlags modifier);
 
+  void SetModifierVisible(ui::EventFlags modifier, bool visible);
+
  private:
   void AddKeyLabel(ui::EventFlags modifier, const std::string& key_label);
 
   typedef std::map<ui::EventFlags, StickyKeyOverlayLabel*> ModifierLabelMap;
   ModifierLabelMap modifier_label_map_;
 
   DISALLOW_COPY_AND_ASSIGN(StickyKeysOverlayView);
 };
 
 StickyKeysOverlayView::StickyKeysOverlayView() {
@@ skipping 41 matching lines @@
     label->SetKeyState(state);
   }
 }
 
 StickyKeyState StickyKeysOverlayView::GetKeyState(ui::EventFlags modifier) {
   ModifierLabelMap::iterator it = modifier_label_map_.find(modifier);
   DCHECK(it != modifier_label_map_.end());
   return it->second->state();
 }
 
+void StickyKeysOverlayView::SetModifierVisible(ui::EventFlags modifier,
+                                               bool visible) {
+  ModifierLabelMap::iterator it = modifier_label_map_.find(modifier);
+  DCHECK(it != modifier_label_map_.end());
+  it->second->SetVisible(visible);
+}
+
 void StickyKeysOverlayView::AddKeyLabel(ui::EventFlags modifier,
                                         const std::string& key_label) {
   StickyKeyOverlayLabel* label = new StickyKeyOverlayLabel(key_label);
   AddChildView(label);
   modifier_label_map_[modifier] = label;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 //  StickyKeysOverlay
 StickyKeysOverlay::StickyKeysOverlay()
@@ skipping 46 matching lines @@
   ui::ScopedLayerAnimationSettings settings(animator);
   settings.SetPreemptionStrategy(
       ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
   settings.SetTweenType(visible ? gfx::Tween::EASE_OUT : gfx::Tween::EASE_IN);
   settings.SetTransitionDuration(
       base::TimeDelta::FromMilliseconds(kSlideAnimationDurationMs));
 
   overlay_widget_->GetLayer()->SetTransform(gfx::Transform());
 }
 
+void StickyKeysOverlay::SetModifierVisible(ui::EventFlags modifier,
+                                           bool visible) {
+  overlay_view_->SetModifierVisible(modifier, visible);
+  widget_size_ = overlay_view_->GetPreferredSize();
+}
+
 void StickyKeysOverlay::SetModifierKeyState(ui::EventFlags modifier,
                                             StickyKeyState state) {
   overlay_view_->SetKeyState(modifier, state);
 }
 
 StickyKeyState StickyKeysOverlay::GetModifierKeyState(
     ui::EventFlags modifier) {
   return overlay_view_->GetKeyState(modifier);
 }
 
@@ skipping 16 matching lines @@
   ui::LayerAnimator* animator = overlay_widget_->GetLayer()->GetAnimator();
   if (animator)
     animator->RemoveObserver(this);
 }
 
 void StickyKeysOverlay::OnLayerAnimationScheduled(
     ui::LayerAnimationSequence* sequence) {
 }
 
 }  // namespace ash