Add sticky key support for AltGr

ash/sticky_keys/sticky_keys_overlay.cc

Index: ash/sticky_keys/sticky_keys_overlay.cc
diff --git a/ash/sticky_keys/sticky_keys_overlay.cc b/ash/sticky_keys/sticky_keys_overlay.cc
index b054af8a14386032b672f47b3e60eacdcb04f475..4d32f0328bf0c70875ebdeb781b9266b3a1a3b96 100644
--- a/ash/sticky_keys/sticky_keys_overlay.cc
+++ b/ash/sticky_keys/sticky_keys_overlay.cc
@@ -161,6 +161,8 @@ StickyKeysOverlayView::StickyKeysOverlayView() {
               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() {}