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

ui/views/controls/combobox/combobox.cc

 // Copyright (c) 2012 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 "ui/views/controls/combobox/combobox.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 522 matching lines @@
   return gfx::Size(total_width, content_size_.height() + insets.height());
 }
 
 const char* Combobox::GetClassName() const {
   return kViewClassName;
 }
 
 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_;
 }
 
 bool Combobox::OnKeyPressed(const ui::KeyEvent& e) {
   // TODO(oshima): handle IME.
   DCHECK_EQ(e.type(), ui::ET_KEY_PRESSED);
 
   DCHECK_GE(selected_index_, 0);
@@ skipping 343 matching lines @@
 
 int Combobox::GetArrowContainerWidth() const {
   const int kNormalPadding = 7;
   int padding = style_ == STYLE_NORMAL
                     ? kNormalPadding * 2
                     : kActionLeftPadding + kActionRightPadding;
   return ArrowSize().width() + padding;
 }
 
 }  // namespace views