NOT FOR COMMIT: Make altgr+left and altgr+right navigate back/forward on views.

ui/views/controls/combobox/combobox.cc

Index: ui/views/controls/combobox/combobox.cc
diff --git a/ui/views/controls/combobox/combobox.cc b/ui/views/controls/combobox/combobox.cc
index dc7797936b73c56c043e2d2873986603ab04804f..693d8fd46b4bb64f1f98d965a1aadea6e4e42274 100644
--- a/ui/views/controls/combobox/combobox.cc
+++ b/ui/views/controls/combobox/combobox.cc
@@ -540,7 +540,7 @@ const char* Combobox::GetClassName() const {
 bool Combobox::SkipDefaultKeyEventProcessing(const ui::KeyEvent& e) {
   // Escape should close the drop down list when it is active, not host UI.
   if (e.key_code() != ui::VKEY_ESCAPE ||
-      e.IsShiftDown() || e.IsControlDown() || e.IsAltDown()) {
+      e.IsShiftDown() || e.IsControlDown() || e.IsAltDown() || e.IsAltGrDown()) {

[Peter Kasting, 2016/05/27 01:11:01]

Nit: 80 columns

     return false;
   }
   return !!menu_runner_;