Add sticky key support for AltGr

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 143 matching lines @@
   SetLayoutManager(new views::BoxLayout(views::BoxLayout::kVertical,
                                         horizontal_spacing,
                                         vertical_spacing,
                                         child_spacing));
   AddKeyLabel(ui::EF_CONTROL_DOWN,
               l10n_util::GetStringUTF8(IDS_ASH_CONTROL_KEY));
   AddKeyLabel(ui::EF_ALT_DOWN,
               l10n_util::GetStringUTF8(IDS_ASH_ALT_KEY));
   AddKeyLabel(ui::EF_SHIFT_DOWN,
               l10n_util::GetStringUTF8(IDS_ASH_SHIFT_KEY));
+  AddKeyLabel(ui::EF_ALTGR_DOWN,

[Tim Song, 2014/02/23 02:07:32]

We should only show this label if the current keyboard makes a distinction
between Alt and AltGr. I would take a look at the X11 XGetModifierMapping
function for doing this.

Also take a look at this mock as the AltGr and right Ctrl modifiers should be
laid out slightly differently:
https://docs.google.com/a/google.com/presentation/d/1DoqmujKSf9bCbK1SM8NYi1rZ...

[Zachary Kuznia, 2014/02/24 19:28:03]

Sounds reasonable.  I'd prefer to split the UI changes into a different CL,
however, as they can be isolated from the functional change.

+              l10n_util::GetStringUTF8(IDS_ASH_ALTGR_KEY));
 }
 
 StickyKeysOverlayView::~StickyKeysOverlayView() {}
 
 void StickyKeysOverlayView::OnPaint(gfx::Canvas* canvas) {
   SkPaint paint;
   paint.setStyle(SkPaint::kFill_Style);
   paint.setColor(SkColorSetARGB(0xB3, 0x55, 0x55, 0x55));
   canvas->DrawRoundRect(GetLocalBounds(), 2, paint);
   views::WidgetDelegateView::OnPaint(canvas);
@@ skipping 110 matching lines @@
   ui::LayerAnimator* animator = overlay_widget_->GetLayer()->GetAnimator();
   if (animator)
     animator->RemoveObserver(this);
 }
 
 void StickyKeysOverlay::OnLayerAnimationScheduled(
     ui::LayerAnimationSequence* sequence) {
 }
 
 }  // namespace ash